Griffin MIDI Connect $35 was $60 at Microcenter. Get this deal

Now you can plug your MIDI keyboards and other devices into your iPod touch, iPhone, or iPad. Use MIDIConnect’s MIDI IN port to play your MIDI-capable instruments and controllers into GarageBand or other MIDI apps. Download MIDI controller apps and use your touchscreen to compose and perform through MIDIConnect’s MIDI OUT port. Both ports are industry-standard 5-pin DIN connectors, compatible with most commonly-available MIDI cables and connectors.