What are some alternatives?
When comparing Slaps and BeatStars, you can also consider the following products
SameTunes - Music social network to compare, share, and discover music.
Music Memos by Apple - An app to capture your song ideas
trending.fm - social music
Guitar Pro 7 - Create, play and share your tabs
Noted - Social music discovery
BeatStars and SoundCloud - Monetize your music and podcasts on SoundCloud