I saw a new student for the first time on Friday. He is learning under my teacher, who very kindly gave him my number when he wanted to continue learning these two weeks (she is currently away on vacation). He is actually my fourth student with violin background, which brings me to this topic:
Is violin and cello technique mutually exclusive?
I used to start out discouraging students with violin background from picking up cello - the more advanced the violin background, the more they were discouraged. My ex-boss (who runs a not very reputable music school) did not agree, saying that she once listened to an ANZCA representative who played violin and cello at a high level.
I dismissed her claim as a myth, saying that I’ll only believe it when I hear it. And til today, I still refuse to believe it until I hear it. On hindsight, she would of course disagree. Why turn down business?
Notice that among the world’s great musicians, many play an instrument and piano at a high level: Rostropovich used to accompany his wife, soprano Galina Vishnevskaya, on the piano, and the conductor of my alma mater, SSO violist Marietta Ku is the first person to have an LRAM in violin, viola and piano.
It may then be said that violin and viola have similar technique. (Most non-violists see them as having the same technique, but all violists swear that they do not, so we can conclude that the technique is similar.) But there is also a high level of interchangeability between string instruments - I know at least two people, both jazz musicians, who are proficient in violin/viola and double bass. I know double bassists who switched over from violin, and double bassists who switched over from cello. I myself picked up the bass guitar a couple of years ago in my old church, and instinctively knew how to play it.
The exception, it seems, is the pairing of violin/viola and cello. There is no musician ever documented who plays violin and cello. Even the great composers like Mendelssohn and Saint-Saens were one or the other. One possible candidate to contest that claim would be Bach, but he was first and foremost a keyboardist, and while he probably played violin and possibly cello, he most likely played neither at an advanced level.
So what makes violin and cello technique so contrary to each other?
My personal opinion is that it’s the similarities between the two that make them difficult to grasp. The technique involved for violin and cello share some similarities, and at the same time display subtle, but important, differences. The technique for violin and viola are similar enough to adapt easily, while for violin and double bass they are more easily distinguished, especially if you use the German bass bow. For violin and cello, however, it’s like the saying: You cannot hate someone unless you have once loved someone - the combination of similarities and differences makes this the most problematic pairing of all.

By far and large, the biggest problem is in the bow grip. As this photo of Jascha Heifetz shows, the fingers of the bow arm are considerably more angled, with the index finger curved, compared to the bow arm of the cellist. The pinky of the violinist is likely to be resting on the stick of the bow, which is not the case for the cello. The violinist’s thumb is also further under the frog than the cellist’s. Lastly, the violinist’s arm (elbow) level is likely to be higher than the cellist’s.

By contrast, the cellist’s fingers meet the bow more squarely, with the thumb more beside the frog than under it. This gives a greater impression of the fingers and thumb on opposing sides of the bow, as opposed to fingers on top and thumb below, for the violinist. Some cellists’ palms will be generally more above the bow than the violinist, whose palm is more beside the bow than above. Note that Jacqueline Du Pre’s (shown above) pinky sits on the bow stick, which is not exactly typical.

Rostropovich’s pinky drapes down over the stick of the bow instead of resting on it. His fingers seem extremely close together - possibly because he had large, powerful fingers?
The fingers of the left hand exhibit similar differences (wow, similar differences XD) to the fingers of the bow hand. The cellist’s fingers generally assume a squarer shape, meeting the strings at a perpendicular angle (this changes at high positions and thumb position, but that’s another story), than the fingers of the violinist, which are more slanted. William Pleeth (Jacqueline Du Pre’s teacher) favoured a slightly slanted left hand in his book, Cello, but I personally interpret what he says as not to insist too much on the square hand shape at the expense of relaxation of hand and fingers, and general playing comfort.
Still on the left hand, the crook of the thumb is an important difference, though you don’t actually need to be aware of it unless you play both instruments. I call it ‘V for violin’ and ‘C for cello’ - the violinist’s thumb creates an angle with the side of the palm, making a V-shape - which is absent in the left hand of the cellist, who forms a C-shape with his fingers and thumb. Occasionally, a confused cellist will form the V-for-violin on the cello and as a result have his/her thumb pointing upwards, or worse, going around the neck of the instrument instead of at the back of the neck.
The left thumb can be a problem for cellists with violin background, as they are used to supporting the instrument and the fingers of the same hand with it. Cellists generally (should) rely less on the thumb, which does not press upwards AT ALL (the term I use for the incorrect, tense neck hold is pinch grip), the cellist’s body instead providing the counterweight to the fingers. Strictly speaking, the violinist’s left thumb does not also press against the neck - an overly tense thumb impedes shifting, after all - but the perceived sensation of not using the thumb at all is usually something new for violinists taking up cello.
With regards to bowing, new converts to cello will need to adjust to the greater bow pressure required to produce a nice, singing tone, especially on the C and G strings. More often than not, they will try to add the pressure from their fingers or pushing in a downward direction with the arm (probably exacerbated by an overly high bow arm). Playing ‘horizontally’ or pulling from a slightly downward direction could be new to them, but it is critical in the quest for a beautiful tone.
(This by the way also is, in my opinion, the biggest difference between violin and viola technique - the viola being somewhere in between violin and cello in terms of required bow pressure on the string. Finger spacing comes in second.)
The difficulties of handling violin and cello seem magnified when I finally look back at everything I wrote (yes, I’m wrapping the post up, huzzah). Are the problems insurmountable? Given that my best student has an advanced violin background (hello, Nat), I’m hesitant to say they are, but if one aspires to take both up to a high level, my belief is that it is a lot of trouble in the making. I’ll actually go out on a limb and say it’s impossible to get, say, a performance diploma or degree in both instruments. That mystery violin-cello performer is still a myth as far as I am concerned. Maybe my ex-boss had low musical standards. Nyahahaha.
The cello is gaining popularity, and I have relaxed my stance somewhat with regards to beginner cello students with violin background, but I still feel I at least owe them a warning - it is not a curse per se, but it is definitely a mixed blessing. Now I tell them to compartmentalize their technique - one for violin and one for cello. Though it will be natural (though not very correct) to rely on what they know of the violin when playing cello for the first few lessons, once they are given more guidance on cello technique, they should be very clear on which is which, and will (hopefully) fare better in their quest.
Though no one in their right mind would gun for a double degree in violin and cello (for all that trouble, it’s not even a good career move), there might be some people (Nat might be one of them) who will want to prove me wrong with a double diploma, or prove me somewhat wrong with a double grade 8. If so, do write in (use the ask function on the sidebar) and let me know your experiences or thoughts! If you have any thoughts on this matter, do feel free to write in and share your thoughts as well! =D