Midi Keyboard on Nexus 7 though USB on the go OTG Android - YouTube
Amazon.com: MIDI to USB/USB C Interface MIDI Cable Adapter with Input & Output Connecting with Keyboard/Piano/Synthesizer for Editing & Recording with Windows, Android, Mac OS, Android, Most Type-c Devices : Musical Instruments
Amazon.com: MIDI to USB/USB C Interface MIDI Cable Adapter with Input & Output Connecting with Keyboard/Piano/Synthesizer for Editing & Recording with Windows, Android, Mac OS, Android, Most Type-c Devices : Musical Instruments
Amazon.com: TNP MIDI Cable Set to USB with Type C Adapter 2 in 1 MIDI Piano USB Cord from PC to Keyboard, Synthesizer, Electronic Drum, Electric Blow Pipe, 16 Channels for Windows,
Android M embraces USB Type-C, MIDI devices | Ars Technica
Amazon.co.jp: NUOSIYA USB - MIDIケーブル 6.5フィート USB MIDIインターフェースアダプター MIDIからUSBケーブル コンバーター 音楽キーボード ピアノからPC Mac ノートパソコン Windows Android用 : 楽器・音響機器
iRig Keys 2 Mini 25 key MIDI keyboard controller, Interface for Education | Counterpoint Direct