iOS Musician Apps (280) Supported Technologies is Inter-App Audio (IAA), Type is Instrument

Portable Music Production Studio : create beats, compose whole tracks, sample, record, sequence, perform, mix and arrange your own music.

Sing a beat and have it automatically and instantly converted to a drum machine beat!

Xynthesizr is a streamlined yet capable 32-step matrix sequencer/monotimbral synthesizer with generative features and MIDI.

Shoom is an expressive XY pad synthesizer. Or, more precisely, three identical synthesizers in one app.

Elastic Drums is a music app showcasing an interactive drum kit, that enables to create a huge range of rhythmic grids, ranging from classical analog drumkits up to experimental soundscapes.

Slice and sequence your loops with a matrix of markov-chain connections. Introduce order with the probability based coin-flipping pattern sequencer.

Pixound provides a deep musical experience that lets you instantly create music using any picture.

Built for Live performance and hands free use, Quantiloop recreates the simplicity of a hardware loop pedal in an iOS app.

Real Guitar is a realistic guitar simulator apps.

BeatMaker is a drum sampler.

iShala is an Indian music software that combines a tabla machine, a lehra player and an electronic tanpura/swarmandal.

The ultimate orchestra sound app for sophisticated musicians by sound designer Kurt Ader, designed as professional sound module for your iPad, iPhone or iPod touch.

Oriental Strings is a professional sound module app for oriental keyboard players and for musicians who simply want to resemble the typical sound of the Middle East in their songs.

The second best sounding piano app in the App Store (after "Colossus Piano")!

This app contains the following instruments: Trumpet, Trombone and Saxophone sampled in four different brass sections.

Play with the sound of a full cathedral organ, created by award-winning sound designer Kurt Ader.

Colossus Piano sets a new standard in terms of realism, detail and overall quality of piano sounds on your iPad, iPhone and iPod touch.

AudioKit Synth One is a completely free & open-source professional iOS Synthesizer. 

Pure Synth® Platinum is a full-blown rompler/synthesizer for your iOS device. Neither the synth engine or the sample engine is an afterthought: Both engines are fully capable and feature-rich. The romper section contains a well rounded assortment of analog, synth, string, digital, and acoustic instruments.

Jam Maestro is a powerful music composition tool for musicians interested in making guitar-centric music.