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Kimya Dawson, Circus Diablo, and Major Maker are all artists that have a song named Rollercoaster.
http://www.playlist.com/searchbeta/tracks#Rollercoaster
http://www.playlist.com/searchbeta/tracks#Rollercoaster
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
M$
Janet Jackson, Bone Brothers, Sun Dial, Ronan Keatling, and M. Ward also have songs with the same name. Click on the link I provided above to listen to each of the songs in full.
That way, you can find out exactly which one you are referring to.