"Feelin' Stronger Every Day" is a song written by Peter Cetera and James Pankow for the group Chicago and recorded for their album Chicago VI (1973). The first single released from that album, it reached #10 on the U.S. Billboard Hot 100.^[1]

The song was a collaboration between bassist Peter Cetera and trombonist James Pankow. Regarding the composition, drummer Danny Seraphine said, "Peter wrote that song about his marriage falling apart. He'd gone through a real hard time and was starting to feel stronger again."^[2]

Cetera himself recalled, "I can remember the exact beginnings of that one... We were at the Akron Rubber Bowl in Akron, Ohio, an outdoor gig that was delayed a bit because of rain, and so, we got there our normal hour and a half before the gig, and we're sitting around, and we were told we're gonna hold for at least an hour, and I heard Jimmy [Pankow] in the other room playing the actual beginning of that song... and I said, 'What is that?' and he went, 'Oh, I don't know, I'm just messing around.'... I went and got my bass, and we sat there and played around with it, and a few weeks later, after we got off the road, I went to his house, and we wrote 'Feelin' Stronger Every Day'."^[3]

Pankow noted that "'Stronger Every Day' was about a relationship but yet, underlying that relationship it's almost like the band is feeling stronger than ever.”^[3]

Cetera played bass and sang lead vocals,^[4] while keyboardist Robert Lamm played Hohner Pianet as well as acoustic piano.^{[citation needed]}

Cash Box said that with this song "Chicago undergoes a slight change in musical directions by straying somewhat away from the sharp horn lines that have so successfully represented their sound in the past."^[5] Record World said that the "band have outdone themselves on this number produced superbly by Jim Guercio" and that the "last half of the record takes off into the ionosphere."^[6]

• Peter Cetera – lead vocals, bass
• Robert Lamm – keyboards, backing vocals, Hohner Pianet
• Terry Kath – guitar, backing vocals
• Danny Seraphine – drums
• James Pankow – trombone
• Lee Loughnane – trumpet
• Walter Parazaider – tenor saxophone