The Modern Drummer on Drum Clinic HD:
The Sound On Sound on Drum Loops HD:
http://www.soundonsound.com/sos/may13/articles/app-works-0513.htm
Musicappblog.com on Drum Loops HD, major update:
http://www.musicappblog.com/drum-loops-hd-update-2/
Stateoftech.net on Drum Loops HD 2:
Drum Loops HD 2 released – New Drum Loops app for iOS, a Drummer for GB
Musicappblog.com on Horn Section HD: