What are some alternatives?
When comparing Splice Beat Maker and Google Music Lab, you can also consider the following products
Sampulator - Make (and record) beats on your keyboard
Ramsophone - A generative art/music machine. (Be sure to refresh!)
BlokDust - Join blocks together to build sounds with this web-based music making app.
Incredibox - Express your musicality, pump it up and chill
Mubert - Electronic music generated in real-time just for you
Super Looper - Make music in your browser