You will Need:
2 buttons (Momentary. I used the smallest kind, tactile.)
Bunches of jumper wires.
1 Perf board
1 3.5mm female jack (Only if your amp has a male jack. :-))
1 speaker with or without an amp (8ohm, 0.25 watts...you get the idea.)
Male Headers (One row of them will do just fine.)
1 Arduino (Preferably UNO.)