Funny, no one mentioned 1, 2 people mentioned 3, first one would count in this case.... That is, if I hadn't made .sid music before.
.sid is a fileformat made using GoatTracker or on the C64. You make .sng files and compile them to .sid. I have done that, so 3 is not the lie.
I started out in the .s3m format when I started tracking. I moved on to the .it format, and for a few co-op's, I have made .xm files. I have never used the .mod format because that format is just too limited, and there's no need for it anymore.
So the lie is 2, which means that bulbapuck is correct.