Question: What American rock band's ex-drummer was David Grohl?

Context paragraphs:
The Colour and the Shape: The Colour and the Shape is the second studio album by the American rock band Foo Fighters.  Produced by Gil Norton, it was released through Capitol Records and the group's own Roswell Records on May 20, 1997.  The record is the debut of the Foo Fighters as a group, as the band's previous record, "Foo Fighters" (1995), was primarily recorded by frontman Dave Grohl and friend Barrett Jones as a demo.  After the project ballooned and became an international success, the group convened for pre-production in the fall of 1996 and brought in producer Norton to establish a pop sensibility for the tracks.  The band strived to create a full-fledged rock record, although the music press predicted another grunge offshoot.

One by One (Foo Fighters album): One by One is the fourth studio album by American rock band Foo Fighters, released on October 22, 2002 by RCA.  The album is the first to feature guitarist Chris Shiflett.  Production on the album was troubled, with initial recording sessions considered unsatisfying and raising tensions between the band members.  They eventually decided to redo the album from scratch during a two-week period at frontman Dave Grohl's home studio in Alexandria, Virginia.  The songs on the album, which include the successful singles "All My Life" and "Times Like These", have been noted for their introspective lyrics and a heavier and more aggressive sound compared to the band's earlier work, which Grohl said was intended to translate the energy of the Foo Fighters' live performances into a recording.

These Days (Foo Fighters song): "These Days" is the third single, (fourth in the UK), from the American rock band Foo Fighters' seventh studio album "Wasting Light".  It was written by Dave Grohl and co-produced by Butch Vig.  Dave Grohl has stated that it is his favourite song that he has ever written.  On August 18, 2012, the Foo Fighters performed "These Days" at Pukkelpop, as a tribute to the people who died or were injured there a year earlier, due to a violent thunderstorm that raged over the festival grounds.

In Your Honor: In Your Honor is the fifth studio album by American rock band Foo Fighters, released on June 14, 2005 by RCA Records.  It is a double album, with one disc containing heavy rock songs and a second disc with mellower acoustic songs.  Frontman Dave Grohl decided to do a diverse blend of songs as he felt that after ten years of existence, the band had to break new ground with their music.  The album was recorded at a newly built studio in Northridge, Los Angeles, and featured guests such as John Paul Jones, Norah Jones and Josh Homme.  The lyrics deal with both resonating and introspective themes, with a major influence from Grohl's involvement on the campaign trail with John Kerry during the 2004 presidential election.

Nirvana (band): Nirvana was an American rock band formed by singer and guitarist Kurt Cobain and bassist Krist Novoselic in Aberdeen, Washington, in 1987.  Nirvana went through a succession of drummers, the longest-lasting being Dave Grohl, who joined in 1990.  Despite releasing only three full-length studio albums in their seven-year career, Nirvana has come to be regarded as one of the most influential and important alternative bands in history.  Though the band dissolved in 1994 after the death of Cobain, their music maintains a popular following and continues to influence modern rock and roll culture.

Wasting Light: Wasting Light is the seventh studio album by American rock band Foo Fighters.  It was released on April 12, 2011 on RCA Records, and is the first album to feature rhythm guitarist Pat Smear since "The Colour and the Shape" (1997), making the band a five piece with the album.  Wishing to capture the essence of the group's earlier work and avoid the artificiality of digital recording, frontman Dave Grohl arranged for the band to record in his garage in Encino, California using only analog equipment.  The sessions were supervised by producer Butch Vig, with whom Grohl had worked on Nirvana's "Nevermind".  Since the old equipment did not allow for many mistakes to be corrected in post-production, the band spent three weeks rehearsing the songs, and Vig had to relearn outdated editing techniques.  The band went for a heavier and rawer sound to contrast with the musical experiments from their previous albums, and most of the lyrics were written as Grohl reflected upon his life and possible future.  Guest musicians include Bob Mould, Krist Novoselic, Jessy Greene, Rami Jaffe and Fee Waybill.

Foo Fighters discography: The discography of Foo Fighters, an American rock band formed in 1994 by Dave Grohl, consists of nine studio albums, four extended plays (EPs), six video albums, and 36 singles.  The current Foo Fighters line-up consists of Grohl (vocals and guitar), Taylor Hawkins (drums), Rami Jaffee (keyboard), Nate Mendel (bass), Chris Shiflett (guitar), and Pat Smear (guitar).

Congregation (song): "Congregation" is a song by American rock band Foo Fighters.  It is the third official single and the second radio single from their eighth studio album "Sonic Highways".  It was released on October 31, 2014.  The song features country music singer Zac Brown, with whom Grohl collaborated with on Zac Brown Band's extended play "The Grohl Sessions, Vol.  1".

Sound City Players: The Sound City Players were a supergroup formed by ex-Nirvana drummer and Foo Fighters guitarist and lead-singer Dave Grohl.  They consisted in a collaboration of Grohl with Krist Novoselic ex-Nirvana, Slipknot's Corey Taylor, Nine Inch Nails' Trent Reznor, Josh Homme from Queens of the Stone Age, Rick Nielsen from Cheap Trick, Rick Springfield, Stevie Nicks, Alain Johannes, Paul McCartney, and many more.

Dave Grohl: David Eric Grohl (born January 14, 1969) is an American rock musician, guitarist, singer, drummer, songwriter, record producer, and film director.  He is the former drummer of the grunge band Nirvana and the frontman and founder of the rock band Foo Fighters, of which he is the lead vocalist, rhythm and lead guitarist, and primary songwriter.

Supporting paragraphs: Sound City Players Nirvana (band)
Answer: Nirvana