I have been streaming via (a) airplay on itunes to either my Denon 4520 in the main room or 1713 in my office. Combine this with the remote app (and a strong wireless signal when I am outside) and it works well.
I also have 4 apple tv's at various locations in the house. I could push out airplay to them or pull the music via the cloud. Again another great option especially with netflix. This saved my a lot of $$$$ versus a whole home contol system.
1 M80,vp180,qs8,aim7,EP500,Denon4520,Rotel RMB-1095