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I didn't know how write a song, (verse, chorus, verse, chorus, bridge, chorus, bridge, verse), etc., and I didn't know how to write lyrics, so that's when I thought, well, I don't have to write a song with all those verses and choruses or lyrics. I can just sing everything the way I want to. So I sang all the instruments with my voice and just went with it.

Source: therumpus.net
I didn't know how write a song, (verse, chorus, verse, chorus, bridge, chorus, bridge, verse), etc., and I didn't know how to write lyrics, so that's when I thought, well, I don't have to write a song with all those