ibeat.org

From site:  Press play! Open Music!

Contemporary music production pack consisting of 16bit wave files available as shots, loops and instrumentals. All available under Creative Commons. Navigate instrumentals by production music genre: Alternative, Laid Back, Hip Hop, Pop, Rock, Swing, Urban, RnB, LoFi, Electronic, Feel Good, Up beat, Groove, Alternative Pop, Acoustic, Ambient.

By Instrument: Bass, Drum Packs, Drum Loops, Orchestra, Strings, Guitar, Noise, Piano Packs