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This is a 1969 photo of rock singer Janis Joplin. (AP Photo) ( JANIS JOPLIN )

Siblings of the late Janis Joplin, Laura and Michael(sitting center), attend her posthumous Hollywood Star ceremony where Kris Kristofferson(back-sunglasses) performed "Me & Bobby McGee", on November 4, 2013 in Hollywood, California. Joplin, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050626 )

This is a 1970 photo of rock singer Janis Joplin. (AP Photo) ( JANIS JOPLIN )

Siblings of the late Janis Joplin, Laura (L) and Michael (R), pose beside Janis's 'Star' during a cemony on November 4, 2013 in Hollywood, California. Joplin, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050629 )

Kris Kristofferson performs "Me & Bobby McGee" live on Hollywood Boulevard during posthumous Star ceremony for the late Janis Joplin on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050623 )

This is an Oct. 1970 photo of rock singer Janis Joplin. (AP Photo) ( JANIS JOPLIN )

Producer Clive Davis speaks at a ceremony honoring the late Janis Joplin with her posthumous Hollywood 'Star' on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050646 )

American blues rock singer Janis Joplin (1943 - 1970), formerly vocalist with the group Big Brother And The Holding Company, now a successful act in her own right. (Photo by George Stroud/Getty Images) ( 96f/15/huch/3788/25 )

This is a 1970 photo of rock singer Janis Joplin. (AP Photo) ( JANIS JOPLIN )

American singer Janis Joplin (1943 - 1970) closes her eyes and cradles a microphone while performing, c. 1967. (Photo by Tucker Ransom/Getty Images) ( T546521_01 )

5th April 1969: American blues-rock singer Janis Joplin (1943 - 1970), of the group Big Brother and the Holding Company. (Photo by Evening Standard/Getty Images) ( 95d37/huch/1736/06 )

A house, formerly owned by the late US rock legend Janis Joplin, is pictured 23 December 2007 in San Francisco. (GABRIEL BOUYS/AFP/Getty Images) ( Was679562 )

5th April 1969: Rock singer Janis Joplin (1943 - 1970). (Photo by Evening Standard/Getty Images) ( 98s/01/huty/10178/01 )

Rock singer Janis Joplin, 26, shows a victory sign as she leaves police headquarters with her attorney, Herbert Goldburg, in Tampa, Fla., on Nov. 20, 1969. Joplin had a preliminary hearing on obscenity charges lodged against her when she allegedly cursed a police who interupted a performance. (AP Photo) ( JOPLIN VICTORY SIGN )

Rock-folk singer Janis Joplin performs with her group in Dec. 1969 at an unknown location. (AP Photo) ( JANIS JOPLIN GROUP )

In this July 29, 1968 file photo, singer Janis Joplin performs at the Newport Folk Festival with her band Big Brother and the Holding Company. (AP Photo, File) ( Rock Hall Janis Joplin )

Folk-rock singer Janis Joplin performs in Dec. 1969 at an unknown location. (AP Photo) ( JANIS JOPLIN )

An October 1970 photo of Janis Joplin. (AP photo) ( JANIS JOPLIN )

Siblings of the late Janis Joplin, Laura (2ndL) and Michael (2ndR), pose with Kris Kristofferson (L) who performed "Me & Bobby McGee" for the crowd, and Clive Davis (R) pose on Janis's 'Star' on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050628 )

Siblings of the late Janis Joplin, Laura (L) and Michael (R), pose beside the Janis Joplin star,during a ceremony on November 4, 2013 in Hollywood, California. Joplin, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050630 )

Kris Kristofferson arrives on stage to perform "Me & Bobby McGee" live on Hollywood Boulevard during posthumous Star ceremony for the late Janis Joplin on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050622 )

Kris Kristofferson performs "Me & Bobby McGee" live on Hollywood Boulevard during posthumous Star ceremony for the late Janis Joplin on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050620 )

Kris Kristofferson performs "Me & Bobby McGee" live on Hollywood Boulevard during posthumous Star ceremony for the late Janis Joplin on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050621 )

Siblings of the late Janis Joplin, Laura (L) and Michael (R), pose beside the Janis Joplin star,during a ceremony on November 4, 2013 in Hollywood, California. Joplin, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050631 )

A plaque honoring the late Janis Joplin with her Hollywood 'Star' is held by her brother Michael during a posthumous Hollywood Star ceremony on November 4, 2013 in Hollywood, California. Joplin, who had her siblings Michael and Laura at the ceremony, would have turned 70 years old this year and is the recipient of the 2,510th Star on the Hollywood Walk of Fame in the Category of Recording. (FREDERIC J. BROWN/AFP/Getty Images) ( Was8050636 )