Final answer:
Al Kooper formed the jazz-rock band Blood, Sweat & Tears. This band was notable for fusing jazz and rock styles, achieving mainstream success with their self-titled second album.
Step-by-step explanation:
Al Kooper, known for his work with Bob Dylan and as a member of the Blues Project, formed the jazz-rock band Blood, Sweat & Tears. After helping to pioneer the jazz-rock genre with the Blues Project, Kooper's new band expanded on these sounds and gained significant popularity.
Blood, Sweat & Tears incorporated a brass section and fused jazz, rock, and even classical elements to create a distinct musical experience, culminating in a breakthrough with their self-titled second album.