Prince fans have plenty to be thankful for this week.

4Ever, a 40-song compilation album of the late singer's greatest hits, is out now, featuring career-spanning favorites including Soft and Wet, Take Me With U and Batdance, in addition to catalog staples such as Purple Rain and Nothing Compares 2 U.

But the two-disc set's most notable track is the previously unreleased Moonbeam Levels. Prince recorded the funk anthem in 1982 for his 1999 album, and later considered it for inclusion on the never-released Rave Unto the Joy Fantastic in 1989. But like the hundreds of unreleased songs that are reportedly housed in a vault at Prince's Paisley Park estate outside Minneapolis, Moonbeam never saw the light of day and only circulated online in bootleg form.

The song is currently unavailable to stream on platforms such as YouTube and Spotify, although it is now available to buy on iTunes and Amazon. ABC News unveiled Moonbeam during an exclusive listening session Tuesday. You can hear the song below (starts at 0:44 seconds).

4Ever is the first of two planned posthumous releases from Prince. The second, expected in early 2017, is a deluxe remaster of Purple Rain, which will be accompanied by a second album of previously unreleased material. According to Prince's NPG label, the plans for the new album were already underway and approved by Prince before his death on April 21.