ReSlice - Slice your audio with an advanced, rhythmic arpeggiator and FX.
Music Walker - Explore and play (via YouTube) songs similar to a seed song.
cassini - Polyphonic Synthesizer for iPhone/iPod touch
Songstack - Swipe to discover new music for Spotify
nlog Synth - Professional Virtual Analogue Synthesizer ::: check nlogmusic at YouTube :::
remixmonsta - Tired of Despacito? Find a cool remix instead