Songstack - Swipe to discover new music for Spotify
Audio Hero - Over 250,000 royalty free music & sound effects for videos
BandNext - Discover bands that sound similar to artists you already love with BandNext. A single click saves your results to a Youtube playlist.
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
22tracks - DJ curated Spotify playlists on iOS
Free Music Archive - Interactive library of high-quality, legal audio downloads