##AWK: 66 bytes##
This is a lot less interesting than my previous answer, but it is a lot shorter, so:
BEGIN{print"X:1\nK:A\nL:1/4\nCCC2C2C2zC2C2C2C2C2zCC2C2C2C2zCCCCC"}
This outputs a valid "abc" file, which can be read into (among others) EasyABC.
It will look like this:
and it will sound like this (midi file).