If you want an inexpensive MIDI controller that you can throw in your backpack and easily take with you anywhere, check out the Korg microKEY 25. The microKEY 25 has all of the essentials: 25 keys, USB connectivity, a pitch-bending expression joystick that can also be assigned to modulation, an onboard arpeggiator, octave up and down buttons, and even a sustain/tap button. Simple, easy to control, and highly intuitive, the Korg microKEY 25 has everything a MIDI-loving musician on the go.