"Ginger" is the proper name of a person (notice it is capitalized)
"Mudhoney" should be capitalized, it is the proper name of a real rock band.
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'library stuff in the public domain' means that the person used music that has a type of copyright license that allows someone to make his/her own music mixes with. If a musician would use music not in the public domain, (for example, a song by Lady Gaga), they would be breaking the law.