From Minecraft Wiki
December 15, 2011
11w50a is the fourth snapshot released for 1.1, and the final snapshot released in 2011.
- Added 15 new splash texts
- Music discs
- Music discs can be obtained if a skeleton kills a creeper
- Baby sheep eat faster
- Debug Features
- Pressing B no longer changes gamemode.
This snapshot was labelled as 11w49a rather than 11w50a.