But for an experienced 4-string player, switching to 5 strings is not as simple as a novice might think. If you watch an advanced cellist perform you quickly realize how much time the left hand spends "south" of the edge of the upper bout. The availability of an E string will change this for many players. However, for a new starter on cello (I don't want to call it a "beginner" exactly) that extra 5th in first to fourth positions opens up the possibility of playing 10 times more music without the need to expand technique.
Some cellos have been converted into 5-stringers for their owners with those works in mind.
I wonder what material would be used today for the added E - steel (plain or covered) presumably.
Another point to bear in mind when having a 4-stringer converted to 5 is that the bowing angles between the strings will change, which may take some getting used to. Changes to the instrument include: major changes to the scroll to accommodate the peg for the extra string, a new bridge, a new nut at the end of the fingerboard, a new tailpiece, possibly a slightly wider fingerboard (and neck?!), and readjustment of the sound post. It all adds up, cost-wise.
Note that all this would also apply to the conversion of a violin from 4 strings to 5, in which case it may be more cost-effective to purchase a new 5-stringer, which are not uncommon in the folk music world.
I think if you plan to modify a 4-string cello to 5-string you will have to remove the "Romberg." A cellist I played with in string quartet for some years had done this to his cello.
I have never played a 5-string cello, but I did have a 5-string violin for a few years. My experience with that led me to write "switching to 5 strings is not as simple as a novice might think." The problem I had was largely "mental" in that I think I tend to intuit the inner strings as "pne to the left or one to the right." That doesn't work if there are 3 inner strings. Since ALL of my playing is done while sight-reading music scores and generally "at speed" I never bothered to go back to basics on a 5-tring instrument. For me, life is just too short for that. If I were a lot younger, who knows. Having played Schubert's "Arpeggione" Sonata on cello and viola, I could not see the point for me - but I'll admit I have not even attempted Bach's 6th cello sonata and have played only part of the 5th.
https://www.youtube.com/watch?v=wbH3JYfRjOQ
I vote for the low string but it depends what you want to do. I multitrack string parts and have found that my low F is good for bass parts - only a half step away from a bass but I can tune down if needed. If you are concerned about finding written repertoire and playing that then go for the high E. If you are playing in a band and will occasionally be playing bass parts then go for the low F.
If you are recording, you can use "effects pedals" to get the lower octaves. This works well. I use a Boss ME-208 for this.
Why don't the good Celtic cellists use five string cellos? Natalie Haas, among many others? You would think that the E string would open up fiddle music in the first four positions, just as it does for the fiddle.
Have a look for Daniel Plane, on the internet. In the past few years he has acquired a five string cello, and in at least one video, he plays very nicely, and doesn't use the top string!!
Good technique helps provides most of the advantages you would expect of a five string cello.
https://www.youtube.com/watch?v=7VmDO5SLUgY
Now, why isn't this more common?
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