Oxygen is Avalon's fourth studio album, released on May 22, 2001 and produced by Brown Bannister and Grant Cunningham. The project was strongly supported by Christian radio, containing six No. 1 radio singles—the most of any Avalon album to date (see below). Oxygen is the first (and so far, only) album by the group to release alongside a Collector's Edition, which features a hidden bonus track, "Beyond the Clouds".
Oxygen received a warm welcome from Christian radio, as the album now boasts six No. 1 radio hits—the most of any Avalon album to date. Highlights include:
"The Glory", the first AC single from Oxygen, received 41 adds from all 41 reporting stations its debut week—the first single at radio to ever achieve 100% participation its first week. "Make It Last Forever", the single issued to CHR, received an initial 14 adds out of 19 reporting stations, giving Avalon a total of 55 adds in just one week. This is an unprecedented mark in not only Avalon's radio history, but for Christian radio as well.
In part because of its success at radio, Oxygen likewise sold many copies at initial release, debuting at #37 on the Billboard 200 chart for the week of June 9, 2001. It spent a total of eleven weeks on the Billboard 200, with #37 its highest ranking to date.