That's actually a
really tough question. I can make a list, but one song? No way lol.
As for just playing (By the way, I'm not very good.

), my favorites have got to be
The Metal by Tenacious D and
It Doesn't Matter by Crush 40. As for playing and singing, not including Say Anything stuff, I'd go with
I Get By by Honest Bob,
No Children by Mountain Goats and
this one lol. I wish I could do some stuff by Three Days Grace, my other favorite band, but I'm not a good enough vocalist.
As for Say Anything, I think my all time favorites to preform are Cemetery, Total Revenge, Alive With the Glory of Love, and A Walk Through Hell.