Thanks for suggestion.Don,sorry if i have introduced confusion:i just mean that myself i just use 2-3 instruments, so it is just a question of need versus money .I did some poses and i must admit that Don did a big,very big job for 200 poses.My problem is having correct positions for fingers,hands when your are not musician.Someday, i have posed a violonist and a friend of mine say it was impossible to play with this position and correct me(he was playing violin himself, not me).That why i was talking about photos reference.