we got 9 last night... playing twinkle twinkle
one person fingering the tune on the top string (we retuned it, not sure to what...

), one person bowing it; one person playing a harmony on the d string, one bowing; two people on each of the e and a strings (one fingerer and one plucker for each) plucking the chord sequence, and the tuba player drumming pencils on the tailpiece.
sorted

we think the world record is 10... can anyone confirm or deny this?
hopefully get some pics of it
Kyle