Stevie Nicks and Fleetwood Mac

Stevie Nicks of the band Fleetwood Mac performs live on stage with the cast of "School of Rock - The Musical" at the Winter Garden Theatre in Manhattan on April 26, 2016.

Stevie Nicks of the band Fleetwood Mac performs live on stage with the cast of "School of Rock - The Musical" at the Winter Garden Theatre on April 26, 2016 in Manhattan.

Drummer Mick Fleetwood and singer Stevie Nicks perform on May 31, 2015, at the Ziggo Dome in Amsterdam.

Singer-songwriter Shakira poses with singer-songwriter Stevie Nicks, the BMI Icon Award recipient, onstage at the 62nd annual BMI Pop Awards at the Regent Beverly Wilshire Hotel in Beverly Hills on May 13, 2014.

John McVie, Christine McVie, Stevie Nicks, Lindsey Buckingham and Mick Fleetwood of Fleetwood Mac pose on stage on NBC's "Today" in Manhattan on Oct. 9, 2014.

John McVie and Stevie Nicks of the classic rock band Fleetwood Mac perform on stage during the bands Fleetwood Mac 2013 Live Tour at the Wells Fargo Center on Saturday, April 6, 2013, in Philadelphia.

Dave Grohl, left, director of the documentary film "Sound City," poses with singer Stevie Nicks at the premiere of the film at the 2013 Sundance Film Festival, Friday, Jan. 18, 2013, in Park City, Utah.

Stevie Nicks performs at the Bank Atlantic Center in Sunrise, Florida, on Aug. 4, 2012.

Singer Stevie Nicks arrives at the 2012 Songwriters Hall of Fame induction and awards gala at the Marriott Marquis Hotel in Manhattan on Thursday, June 14, 2012.

Christine McVie, Dave McVie, Dave Walker, Bob Welch, Mick Fleetwood, Bob Weston and John McVie of Fleetwood Mac pose in this undated photo.

John McVie, left, Lindsey Buckingham, Mick Fleetwood, Stevie Nicks and Christine McVie in an undated photo.

An undated photo of Stevie Nicks of Fleetwood Mac.

An undated file photo of Fleetwood Mac.

Stevie Nicks performs on ABC's "Good Morning America" at Rumsey Playfield in New York's Central Park on Aug. 26, 2011.

Stevie Nicks performs on the third day of the Hard Rock Calling music festival at Hyde Park in London on June 26, 2011.

Rod Stewart and Stevie Nicks perform at Madison Square Garden on March 26, 2011.

Stevie Nicks performs at Philips Arena in Atlanta, Georgia, on March 24, 2011.

Taylor Swift and Stevie Nicks perform at the 52nd annual Grammy Awards at Staples Center in Los Angeles on Jan. 31, 2010.

John McVie and Stevie Nicks of Fleetwood Mac perform at Madison Square Garden on March 19, 2009.

Stevie Nicks of Fleetwood Mac performs at Madison Square Garden on March 19, 2009.

Stevie Nicks performs at the Nikon at Jones Beach Theater in Wantagh on June 29, 2008.

Singer Stevie Nicks meets Belle, a 2-month-old dog rescued from the Gulf hurricane region and offered for adoption by Long Island's North Shore Animal League, after her performance on the NBC-TV "Today" show, Wednesday Sept. 28, 2005.

Veteran rock singer-songwriter Stevie Nicks in an undated photo.

The rock group Fleetwood Mac poses in this promotional photo for its new album, "Say You Will," its first with new material since 1987. Members, from left, are Lindsey Buckingham, Mick Fleetwood, Stevie Nicks and John McVie, in 2003.

Stevie Nicks performs at a private show to introduce her May 2001 release, ''Trouble in Shangri-la," her first solo album since 1994, at SIR Studios in Los Angeles on March 31, 2001.

Members of Fleetwood Mac hold their awards after the group was inducted into the Rock and Roll Hall of Fame in New York on Jan. 12,1998.

Fleetwood Mac rocks during their induction to the Rock and Roll Hall of Fame on Jan. 12, 1998.

Stevie Nicks and Lindsey Buckingham of Fleetwood Mac perform during their Rock and Roll Hall of Fame induction on Jan. 12, 1998.

Stevie Nicks of Fleetwood Mac performs at Nassau Coliseum on Sept. 23, 1997.

Rock group Fleetwood Mac, reuniting after 13 years apart, performs during the American Gala evening at the Capital Centre in Landover, Md. on Jan. 18, 1993.

Vocalist Stevie Nicks, left, and guitarist Rick Vito of the rock group Fleetwood Mac are shown at the Hard Rock Cafe in Boston, Ma., Monday, Nov. 13, 1990, after they presented the cafe with a vintage Gibson guitar used on their United States tour.

Members of the rock and roll group Fleetwood Mac pose at a news conference in West Hollywood, Ca., on Tuesday, Aug. 18, 1987.

Singer Stevie Nicks playing at the U.S. music festival in San Bernardino, California on Sept. 5, 1982.

From left, John McVie, Mick Fleetwood, Stevie Nicks and Lindsey Buckingham of Fleetwood Mac.

Former member of Fleetwood Mac, Bob Welch, performs songs from his hit "French Kiss" album during a 1979 Hollywood performance at the Whiskey A Go Go nightclub.

This is a 1976 photo of the rock and roll group Fleetwood Mac: from left, Mick Fleetwood, John McVie, Christine McVie, Lindsey Buckingham and Stevie Nicks.