This wiki article states two different answers in two different locations and coupled with my in game results has me completely confused.
Specifically it says in one place:
After the 15 December 2011 snapshot (11w50a), all discs except "11" could be dropped by Creepers.
And in another place it says:
Currently, the other nine music discs can not yet be obtained without Creative mode, SMP Server commands or external tools.
I, myself, in single player survival can only seem to get two discs; CAT and 13.
Are these the only discs avalable in SPS, or is my luck just horrible? (out of 14 successfull Skeleton vs Creeper attempts, I've still only gotten those two discs.