In July 1970, Traffic was deep into their transformation as a band, as showcased by their live recording at the Fillmore West. Prior to this concert, they released "John Barleycorn Must Die," an album that marked a significant evolution in their sound, integrating more jazz and rock elements. This album, released in 1970, was pivotal in cementing their status in the progressive rock genre. The Fillmore West concert highlights the band's improvisational skills and features tracks from their recent work, including "Medicated Goo" and "Who Knows What Tomorrow May Bring." Traffic's lineup during this period included the notable presence of Steve Winwood, whose vocals and multi-instrumental abilities were crucial. This performance also reflects their peak period of creativity and collaboration, signifying a moment where their live performances became just as influential as their studio recordings, capturing the raw energy and experimentation that defined their sound.