A project that plays the Fibonacci Sequence based on mod(ular arithmetic). Put in a number... and press enter. The tune is somewhat monotonous, though, and not really meant for anything other that just to play around in Scratch.
Uses some of the code from this project: http://scratch.mit.edu/projects/3146395/ Also, uses the exact same idea as this: http://www.youtube.com/watch?annotation_id=annotation_1286709597&feature=iv&src_vid=Nu-lW-Ifyec&v=acTrvMlpuxA