What is it you are trying to achieve?
You can use an avr to play music of course, but depending on how serious you are about your music, the general concensus is that a 2 channel hifi amplifier will do a better job.
I have a decent avr but having listened to some hifi amps I decided I wanted to go that way. I currently have pre-outs from my avr that connect my hifi amp. This way my hifi amp drives my front speakers when watching tv/films, but it's also connected to my music server (via a DAC) for when I want to listen to to music. This way I didn't need to buy two sets of speakers.