Background: Daryl Hall and John Oates, often referred to as Hall & Oates, are an American musical duo. Daryl Hall is generally the lead vocalist; John Oates primarily plays electric guitar and provides backing vocals. The two write most of the songs they perform, separately or in collaboration. They achieved their greatest fame from the late 1970s to the mid-1980s with a fusion of rock and roll and rhythm and blues.
Context: Their next album, H2O, a very polished, synth-heavy effort, became the duo's most successful album, with US sales eventually approaching four million copies. H2O reached #3 on the Billboard album chart (where it held for 15 weeks) and spawned three Top 10 singles. "Maneater", the biggest hit of their career, reached Number 1 on December 18, 1982 and stayed there for four weeks.  The soulful ballad "One on One" and a cover of Mike Oldfield's "Family Man" reached Number 7 and Number 6 in March and June 1983, respectively.  According to John Oates, they recorded approximately 20 songs for the album, of which 9 didn't make the final cut. He went on to say they usually would have 5 or 6 tracks left over per album.  "One On One," with its clever mixed-metaphorical references to romance and basketball, was used in NBA commercials of the period. The commercial featured numerous players, including Hall of Famer James Worthy performing a 360-degree slow-motion lay-up during the saxophone solo.  For the H2O album, Hall and Oates made some permanent changes to their current band. Drummer Mickey Curry, who had appeared on some Private Eyes tracks, including the title song, replaced Jerry Marotta full-time. Bassist Tom "T-Bone" Wolk, who had mimed John Siegler's bass line in the "Private Eyes" video, replaced Siegler full-time. These two joined the band's holdovers--lead guitar player G.E. Smith, and saxophonist Charlie "Mr. Casual" DeChant. De Chant and Wolk continued to perform with the duo until Wolk's death in early 2010, while Curry returned for the Do It for Love sessions.
Question: What is H2O?. Whats the answer?
Their next album,