"Cinnamon Girl" is a song by Prince, from his 2004 album Musicology. Besides the title, there is no connection to the song of the same name by Neil Young.
The single has been released in multiple formats. On September 6, 2004, the European CD-single was released with 4 tracks: "Cinnamon Girl" (Album version), "Dear Mr. Man" (live at Webster Hall) "United States of Division" (which was previously available only as a download) and an MPEG video of the "Dear Mr. Man" performance. Two weeks later, a similar single was released, but without the video. In November of the same year, Prince's NPG online retail store sold an Enhanced CD including the audio track, its music video, the lyrics and a 5-minute segment of interviews and behind-the-scenes footage.
"Cinnamon Girl" is a song by Neil Young. It debuted on the 1969 album Everybody Knows This Is Nowhere, which was also Neil's first album with backing band Crazy Horse. It is well known for its opening distorted-guitar riff, which continues through the song. The single reached #55 on the U.S. Billboard Hot 100 in 1970.