Been listening to a comprehensive J-5 best-of ("Jackson 5 Gold", a 2-disc set). Thankfully it includes some cool early B-sides like "I Found That Girl" and "Darling Dear" and their fab cover of "Doctor My Eyes" -- I had to buy a British GH of theirs to get that on vinyl back in the '80s.
NTM: "Love Song", last track on disc 1, apparently the B-side of "Looking Thru the Windows"; both of those, like "Never Can say Goodbye", written by the late Clifton Davis.