Good Days is an album by the Chicago Underground Quartet, featuring trumpeter Rob Mazurek, guitarist Jeff Parker, keyboardist Josh Johnson, and drummer Chad Taylor.

[1][2] Regarding the 19-year gap between the band's previous release, Chicago Underground Quartet, and Good Days, Mazurek reflected: "It didn't feel like any time had passed.

"[4] In a review for DownBeat, Aaron Cohen wrote: "Good Days illustrates how much the quartet remains a part of Chicago's history of free-jazz and open-ended improvisation... As geographically dispersed as these musicians might be nowadays, they’ve never abandon their ideals.

"[7] The Chicago Reader's Noah Berlatsky remarked: "Part of what's so engaging and inspirational about Good Days is that it feels like such a natural continuation of the band's freewheeling spirit—something that easily could've ended up being lightning in a bottle, never captured again after the 2001 album.

"[9] In an article for Point of Departure, Troy Collins wrote: "As the album progresses, it becomes clear how much the original members have grown over the past two decades... Good Days is a stellar example of artistic maturity, and while it sounds new, it's also a natural continuation of the band's formative work.