SUBSTITUTE by The Who
The Who are just awesome, Pete Townsend plays some of the coolest guitar parts ever and in this song he uses triad shapes to create an all time classic riff, followed by some great riffage in the rest of the song. It's a challenging one to sing and play but lots of fun too and I'm sure you'll enjoy playing it as much as I do.
Check out how cool Keith Moon looks in the original video too!!