Apparently nobody since has been able to caress such sweetness out of this instrument as Feuermann. Here's his Chopin's Nocturne recorded many years ago:

www.youtube.com/watch?v=xjVN-abVeZs

Two other masters, different genres:

Eberhard Weber (double bass), here with a solo, Brother Wind and this one.

David Darling (cello):
In Motion (from Dark Wood)
Cycle One Namaste
...and on a more classical note, from the New Directions Festival