"Vol. 4" was released in September 1972, and while most critics of the era were dismissive of the album, it achieved gold status in less than a month, and was the band's fourth consecutive release to sell one million copies in the United States. It reached number 13 on "Billboard's" pop album chart and number 8 on the UK Albums Chart. The song "Tomorrow's Dream" was released as a single but failed to chart. Following an extensive tour of the United States, the band toured Australia for the first time in 1973, and later Europe.