Rediscovering lost or forgotten gems is this week's theme of CBC host Tom Power's weekly look at new music.

First up is a new album of previously unreleased tracks from the late Johnny Cash that his son, John Carter Cash, discovered while sifting through his parents' archives. Restored and released this week, Out Among the Stars highlights songs initially recorded in 1981 and 1984, when music's Man in Black was fresh out of a rehab stint and newly focused on his career.

Next up is the 20th anniversary re-release of Definitely Maybe, the landmark album by one of contemporary British rock's most influential — and most contentious — groups, Oasis. The band, led by Noel and Liam Gallagher, has inspired groups from Coldplay to Keane to Maroon 5.

Finally, to mark its 40th anniversary, iconic Canadian group Rush is reissuing its self-titled debut album. If the prog-rock trio sounds a bit unusual, it's because it's the only album with John Rutsey on drums, before he was replaced by Neil Peart.

Watch the attached video to check out excerpts of music from Johnny Cash, Oasis and Rush.