I just got done reworking another artist's song. I love answering or reworking other artists' work. It's how I got into songwriting - well writing parodies was, but you get the point. It went from parodies, to answers, to original songs. I feel so accomplished right now.
This was neither a parody or an answer, tho. I guess it was more of an interpolation, which is something else I love doing. Except for the song title, everything is new.