Twenty 1 is the seventeenth studio album (and twenty-first overall) by the American band Chicago. Released on January 29, 1991, it was their first album of the 1990s. Twenty 1 spent eleven weeks on the American Billboard 200, peaking at position No. 66, and did not chart in the UK.
Production
The production of Twenty 1 saw a significant personnel reconfiguration. The recent departure of founding drummer Danny Seraphine had made way for the band's "great new drummer"
thumb|left|[[Tris Imboden was the band's new drummer for the album.|200px]]
The band retained producer Ron Nevison, who'd already done Chicago 19. According to Nevison, work on the album was somewhat fragmented, with the band members rarely being in the studio together, and with work continuing with session musicians while the band was on tour. The fragmentation was furthered when Humberto Gatica was assigned to mix the final version of the album without Nevison's input.