[2] It produced the band's most successful and final hit, a recording of the John Denver song "Leaving on a Jet Plane".

The album peaked at number 15 on Billboard magazine's Top LP chart and was nominated for a Grammy Award in the Best Folk Performance category.

It stayed on the charts and rose again in 1969, thanks to the single release of "Leaving on a Jet Plane".

The song "I'm in Love with a Big Blue Frog" was written by Leslie Braunstein, who was the original lead singer of Soft White Underbelly, the band that became Blue Öyster Cult.

[3][4][5] The cover is styled after one of the promotional photographs for the movie Bonnie and Clyde that showed the gang holding machine guns.