Lyrics: What does "What did you do?" mean and why do I have to provide a source?

Here you choose how the song was created: Original, Remix, Cover, Mashup or Sample a song. For everything except Original, the source is required. You enter the title and artist of the original, and for Mashup and Sampling, one line for each source. The tool also shows a rights notice: if you use someone else's material, you usually need the permission of the rights holders (author, publisher, label) to release it. With your source information, you can later prove what you used.