Bootleg Series Vol. 4: Bob Dylan Live 1966, The "Royal Albert Hall" Concert. In February 1966, Nancy Sinatra's song "These Boots Are Made for Walkin'" became very popular. In 1966, The Supremes A' Go-Go was the first album by a female group to reach the top position of the Billboard magazine pop albums chart in the United States. The Seekers were the first Australian Group to have a number one with "Georgy Girl" in 1966. Jefferson Airplane released the influential Surrealistic Pillow in 1967. The Velvet Underground released its self-titled debut album The Velvet Underground & Nico in 1967. The Doors released its self-titled debut album The Doors in January 1967. Love released Forever Changes in 1967. The Procol Harum released A Whiter Shade of Pale in 1967. Cream released "Disraeli Gears" in 1967. The Jimi Hendrix Experience released two successful albums during 1967, Are You Experienced and Axis: Bold as Love, that innovate both guitar, trio and recording techniques. The Moody Blues released the album Days of Future Passed in November 1967. R&B legend Otis Redding has his first No. 1 hit with "Sitting on the Dock of the Bay". He also played at the Monterey Pop Festival in 1967 just before he died in a plane crash. Pink Floyd released its debut record The Piper at the Gates of Dawn. Bob Dylan released the Country rock album John Wesley Harding in December 1967. The Bee Gees released their international debut album Bee Gees 1st in July 1967 which included the pop standard "To Love Somebody". The Monterey Pop Festival in 1967 was the beginning of the "Summer of Love". The Beatles released Sgt. Pepper's Lonely Hearts Club Band in 1967. It was nicknamed "The Soundtrack of the Summer of Love". Johnny Cash released At Folsom Prison in 1968. 1968: after The Yardbirds fold, Led Zeppelin was formed by Jimmy Page and manager Peter Grant, with Robert Plant, John Bonham and John Paul Jones; and released their debut album Led Zeppelin. Big Brother and the Holding Company, with Janis Joplin as lead singer, became an overnight sensation after their performance at the Monterey Pop Festival in 1967 and released their second album Cheap Thrills in 1968. Gram Parsons with The Byrds released the influential LP Sweetheart of the Rodeo in late 1968, forming the basis for country rock. The Jimi Hendrix Experience released the influential double LP Electric Ladyland