I Am T-Pain created quite a splash when it was released. Take one of the best known musicians and release an app that lets anyone record songs in his musical style (autotune). That's what I Am T-Pain does and does so very well. Sing in to the mic and the live as you sing autotune goes to it and records your voice, autotuned.

Developer: Smule
Original Release Date: 1279639800
Category: 6011
Currently $2.99 in the iTunes app store.

2009 Best Musical Synthesizer App Second Place

BeatMaker by INTUA


Original Release Date: 1232751600
Category: 6011
Currently $4.99 in the iTunes app store.

2009 Best Musical Synthesizer App Third Place

Music Studio by Alexander Gross


Original Release Date: 1283295600
Category: 6011
Currently $14.99 in the iTunes app store.

2009 Best Musical Synthesizer App Honorable Mentions

8 Track Mind

Developer: Improbable Sciences
Original Release Date: 1260230400
Not currently available in the iTunes app store.

Star6

Developer: Agile Partners
Original Release Date: 0
Not currently available in the iTunes app store.

Developer:
Original Release Date:
Not currently available in the iTunes app store.

Sonifi

Developer: Sonik Architects
Original Release Date: 1248303600
Currently $4.99 in the iTunes app store.

VocaForm

Developer: Skilpadde Labs Inc.
Original Release Date: 0
Not currently available in the iTunes app store.

Noise.io™ Pro Synth

Developer: Ilya Plavunov
Original Release Date: 1260833400
Not currently available in the iTunes app store.

Bloom

Developer: Opal Limited
Original Release Date: 1263890160
Currently $3.99 in the iTunes app store.