DonRoos wrote:
It is not dependant on the instrument, rather the role. If you are play the melody then it is easy to sing along. If you are playing solo's and lead breaks if fillin stuff then is more difficult. Hence my sticking to rythm guitar.
I think that's it. The theory about bass playing and singing was that it's difficult because the bass line is so different to the melody line. I think if the guitar/bass/whatever part is close to the vocal line, I think more in terms of timing than in notes, then the task is less difficult.