In your opinion what is the hardest instrument to play...mainstream ones alteast? I wanted to nominate the guitar simply because making a string of notes sound right requires good amount of right and left hand coordination but then I got to thinking about the Piano. While it's easier to get something decent sounding out of a Piano right away, eventually the musician has to teach him/her self playing seperate pieces from right and left hand. Bass is hard also because slap technique takes a good time to get right (For me at least) All things considered I'd say the Piano is the hardest to play IMO. You?