John O'Brien has been making music for more than four decades, and his latest single suggests the pleasure has not faded. 'A Sunny Day', released on 25 May 2026, is the second single from O'Brien's forthcoming tenth album, due in early 2027, and it captures the joyful feel of Chicago's classic sound, with horns running alongside the traditional rock elements.
John O'Brien: Four Decades and a Sunny Day
