"The Rain, The Park & Other Things" single sold over a million copies in late 1967 and reached number 2 on the Billboard Hot 100. Their second MGM album, "We Can Fly", released in 1968 and produced by Billy Cowsill, at the age of twenty, spawned a second Top 40 hit with the title track, which was co-written by Cowsill. In 1968, "Indian Lake" (from their third MGM album "Captain Sad and his Ship of Fools") became another top 10 hit, while in 1969 their version of the title track from "Hair", with Billy Cowsill singing lead vocals, peaked at No. 2.