First, click the power button then type in your scratch username (if you dont have an account, type in guest) then do whatever you want UPDATE: typing in guest now works
all songs are from youtube (exept for number 7, witch is from a project called sound bounce.copy and paste this into your search bar http://scratch.mit.edu/projects/10368797/ if you make a remix, there are instructions on how to put your own songs in in the "I tunes" sprite, and how to put your own pictures in in the "I photo" sprite.