Question: Who has performed with more band, Trey Anastasio or Sarah Nixey?
Context: Sarah Anne Nixey (born 21 December 1973 in Dorset, England) is a British singer songwriter, best known as the vocalist in Black Box Recorder.  Her debut solo album, "Sing, Memory", was released on 19 February 2007, followed by "Brave Tin Soldiers", released on 9 May 2011.  Nixey currently lives in London with her husband, music producer Jimmy Hogarth, whom she married in late 2010 and has one son, Reuben (born late 2007) and a daughter, Lola (born late 2012).  Nixey has a daughter, Ava (born 2001) from her previous marriage with John Moore. Tony Markellis is a bassist and record producer from Helena, Montana, now residing in Saratoga Springs, New York.  In his forty-five year career he has played blues, folk, jazz, rock and country music with musicians such as Trey Anastasio, Paul Butterfield, The Mamas & the Papas, Johnny Shines, David Bromberg, David Amram, Paul Siebel, Rosalie Sorrels, Eric Von Schmidt, Ellen McIlwaine, Mary McCaslin, Railbird and Jo Henley.  Markellis was a founding member of the groundbreaking Vermont-based jazz fusion group Kilimanjaro, as well as the Unknown Blues Band featuring Big Joe Burrell.  In the late 1990s, Markellis became the first member of the first solo band of Phish guitarist Trey Anastasio, forming the rhythm section with drummer Russ Lawton.  Including his work with Anastasio, Markellis has appeared on over one hundred albums.  In addition to tours with the Trey Anastasio Band, he is currently working with Kilimanjaro, acoustic blues power trios No Outlet and Street Corner Holler, The Burns Sisters Band, bluegrass fusion band Floodwood, acoustic Grateful Dead cover band Dead2Me, singer/songwriters Michael Jerling and Bob Warren, and occasionally with Americana band Jo Henley.  On June 20, 2010 (Fathers Day), Tony was invited on stage at Saratoga Performing Arts Center (SPAC) to play bass with Phish on "Gotta Jibboo" (one of the songs he cowrote with Trey and Russ Lawton for the Trey Anastasio Band).  Phish's bassist, Mike Gordon played the second guitar during the song. Ernest Joseph "Trey" Anastasio III ( , born September 30, 1964) is an American guitarist, composer, and vocalist noted for his work with the band Phish, and his solo career, including the Trey Anastasio Band and the orchestral "Evenings with Trey Anastasio" performed with the New York Philharmonic, the Los Angeles Philharmonic, the Atlanta Symphony Orchestra, the Baltimore Symphony, the Pittsburgh Symphony, and the Colorado Symphony. Trey Anastasio is a self-titled album by the guitarist and composer Trey Anastasio.  It was released on April 30, 2002 by Elektra Records and recorded at "The Barn", his studio near Westford, Vermont.  Some of the songs included are evolved, but much less experimental versions of tracks on Anastasio first solo album, "One Man's Trash", released in 1998.  The tracks included were written by Anastasio, along with Tom Marshall, Tony Markellis, Russ Lawton and Scott Herman. One Man's Trash is Trey Anastasio's first solo album apart from Phish, recorded in the Fungus Factory or in The Barn between 1997 and 1998 during breaks of touring and recording with Phish.  The release includes early experimental noise explorations, some of which were reincarnated later into his second album, "Trey Anastasio", released in 2002.  "One Man's Trash" was released on October 27, 1998. 70 Volt Parade was Trey Anastasio's backing band in 2005, formed after the breakup of Phish in August of the previous year.  After writing and recording new material in late 2004 and early 2005, Anastasio began auditioning various musicians for his next project.  This band essentially replaced Anastasio's first backup band that was together in different forms from 1999 to 2004.  70 Volt Parade originally included Peter Chwazik on bass (later replaced by Tony Hall), Skeeto Valdez on drums (later replaced by Raymond Weber), Les Hall on guitar and keyboards, and Ray Paczkowski also on keyboards.  In 2006, with Les Hall out of the lineup, and a new musical focus for Anastasio, the 70 Volt Parade name was dropped.   "Spin" is the tenth track of "Shine", the 2005 release Trey Anastasio, although the song is credited to both Trey Anastasio and Brendan O'Brien.  It was recorded in mid-2005 at the Southern Tracks Recording Studio in Atlanta, GA.  It was debuted live on August 4, 2005 at the Bank of America Pavilion in Boston, MA. Russ Lawton is a professional drummer from Vermont.  He is best known as the drummer from the solo band of Phish guitarist Trey Anastasio.  Lawton also performs with the Vermont jam band Strangefolk and The Chrome Cowboys.  Lawton performed on Mike Gordon's albums "Inside In" and "The Green Sparrow". Recently, Russ sat in with the Vermont-based "Book'em Blues Band" for an evening of blues and rock on April 14, 2009 at Nectar's in Burlington, Vermont.  Among those Russ has a worked with is Ish drummer Jason Osborn.  Lawton recently appeared on Late Night With Jimmy Fallon with Trey Anastasio Band. Since 1998, Trey Anastasio, best known from Phish, has toured and recorded with several backup musicians, including several side-projects organized and led by the guitarist and composer.  While active, his bands did not have a name.  Fans commonly referred to them as Trey Anastasio Band, or TAB for short or "The Two for Five band".  This group should not be confused with the current Trey Anastasio Band, which was renamed in 2006 from its original name 70 Volt Parade. "Shine" is a song by American musician Trey Anastasio.  It was released on October 11, 2005 as a single from the album of the same name.  Credited to both Trey Anastasio and Brendan O'Brien, it was recorded in mid-2005 at the Southern Tracks Recording Studio in Atlanta, Georgia.  Anastasio admits that "Shine" was written after all of the other tracks on the album, as a way to "tie it all together."  It was debuted live on July 24, 2005, at the 10,000 Lakes Festival in Detroit Lakes, Minnesota.
Answer: Trey Anastasio