Well... I just leveled an Archer to get Bard so I could do this. Now I see that not only is there no in-game macroing for playing songs, but it seems that any idea of using AHK (auto hot key) scripting to play a tune is out of the question (I don't want to risk getting banned just because I want to be able to play songs).
I have a lot of public domain sheet music (violin/viola) that would have been nice to be able to program.

Oh well, I guess puttering at the keyboard will have to suffice.