Question: Which American rock band was formed in California, Cave In or Grandaddy?

Context paragraphs:
Cave In discography: The discography of Cave In, an American rock band, consists of four studio albums, two live albums, two compilation albums, seven EPs, three singles, three splits, eight compilation contributions and three music videos.  Cave In formed in 1995 in Methuen, Massachusetts, where thereafter they began releasing several split singles and demos that eventually culminated in the 1998 compilation album "Beyond Hypothermia".  Cave In's first studio album, "Until Your Heart Stops", was released later in 1998 through Hydra Head Records.  These early releases from the band are often considered important albums in developing the metalcore genre.  The band gradually began to move away from heavy metal and took a more alternative rock and progressive rock approach to their music beginning in 1999 with the EP "Creative Eclipses".  This new direction continued with "Jupiter", Cave In's second studio album in 2000.  Cave In released one more EP through Hydra Head Records in 2002, "Tides of Tomorrow", before signing with RCA Records.

Grandaddy: Grandaddy is an American indie rock band from Modesto, California.  The group was formed in 1992, and featured Jason Lytle, Aaron Burtch, Jim Fairchild, Kevin Garcia and Tim Dryden.

I Heart California: I Heart California is the debut studio album by American indie rock band Admiral Radley, a collaboration of members from the bands Grandaddy and Earlimart.  It was released on July 13, 2010 by record label The Ship.

Cave In: Cave In is an American rock band that formed in 1995, in Methuen, Massachusetts.  After several members changes in the late 1990s, their lineup solidified with the 1998 release of "Until Your Heart Stops" through Hydra Head Records.  Their early albums were prominent in the metalcore scene.  After this release, the band started experimenting with other genres.  Cave In later received mainstream recognition for their 2003 RCA Records album "Antenna" and its lead single "Anchor," which had an overall alternative rock style.  The group went on hiatus in 2006 and later reformed in 2009 with the release of a new EP, "Planets of Old", as well as a new LP in 2011, titled "White Silence".  Both of these post-hiatus releases saw a return to Cave In's earlier and heavier sound.

Admiral Radley: Admiral Radley is an American indie rock band based in California, formed in late 2009 by members from the bands Grandaddy (Jason Lytle and Aaron Burtch) and Earlimart (Aaron Espinoza and Ariana Murray).  Admiral Radley released their debut album, "I Heart California", on July 13, 2010 on their label The Ship.

Marjorie Fair: Marjorie Fair is an indie rock/shoegaze American band formed in New Jersey by musician Evan Slamka, and based in Los Angeles, California.  The band is best known for their debut album "Self Help Serenade", released in 2004 on Capitol Records.  Marjorie Fair's melodic psychedelia has been compared to Mercury Rev, Pernice Brothers, The Beach Boys, Grandaddy, Elliott Smith and the solo works of Jon Brion, who contributed minor parts to "Self Help Serenade".

Grandaddy discography: Grandaddy is an American indie rock band from Modesto, California.  They have released five studio albums, four self-released albums, four compilation albums, six EPs, sixteen singles and five split singles.

Earlimart (band): Earlimart is an Indie rock band formed in 1998 in Los Angeles, California, and named after the town of Earlimart, California.  The main members are Aaron Espinoza and Ariana Murray.  Their early sound has been described as "post-punk", and compared to that of Pixies, Sonic Youth and Sparklehorse; later music has been compared to that of Grandaddy and Elliott Smith.  In 2009, Espinoza and Murray joined with Jason Lytle and Aaron Burtch, formerly of Grandaddy, to record an album entitled "I Heart California", which was released in 2010 under the name Admiral Radley.

The Arm of Roger: The Arm of Roger is a fake band created by Jason Lytle and other members of American Rock band 'Grandaddy'.  Back in 1999, Jason Lytle finished the mixing for the Sophtware Slump; in the prior two years however, the band wrote and performed joke songs made to sound awful.  Before they sent them tapes for the real album, he created and sent 7 tapes of their joke album 'The Ham and it's Lily' in hopes for a reaction.  On the following Tuesday, a V2 Records official called and said "I got the album…. now will you send me the real one you fucking asshole?!"  They then sent over The Sophtware Slump, the real album.

Antenna (Cave In album): Antenna is the third studio album and the first major label album by the American rock band Cave In.  Released in 2003, it was Cave In's first and only album for RCA before they were dropped by RCA and re-signed with Hydra Head.  "Antenna" marked a more commercial shift in Cave In's style which, while critically praised, was met with uneasiness from the band and distaste from longtime fans.  In the midst of such polarization, the band began a return to its previous style, resulting in "Perfect Pitch Black" in 2005.

Supporting paragraphs: Cave In Grandaddy
Answer: Grandaddy