Question: On which group is this artist, who signed and numbered the lithograph for the pre-ordered album "By the People, for the People," currently a vocalist?

Context paragraphs:
Wind Up Toys (album): Wind Up Toys is the third studio album from UK punk band Capdown released on February 5, 2007.  It is also the first Capdown album to be released on the Fierce Panda Records label.  Anyone who pre-ordered the album from Banquet Records in Kingston (UK) would get signed copies of the album as well as a free three live track EP.

Nichidatsu Fujii's movement: In 1981, Nichidatsu Fujii dispatched his followers to march and chant around the globe in support of the U.N. 2nd.  special session for disarmament.  In the U.S. marchers began in New Orleans, L.A. and San Francisco, in Canada marchers began in Montreal and Toronto.  The San Francisco March began on Oct. 21, 1981 with a ceremony on Alcatraz.  13 marchers, being Buddhist followers of Nipponzan-Myōhōji, Native Americans, U.S. and German citizens, began the S.F. march.  marching about 20 mile per day they were hosted each night by community groups in every town and on Native reservations.  many mayors and town councils made proclamations and such honoring the peace and disarmament marchers.  Over the course of the march citizens were moved to join.  By the time they arrived in Chicago the S.F. marchers numbered about 30.  In May 1982 the group of about 40 marchers from Toronto joined the S.F. group in Buffalo N.Y. at the International Peace Bridge doubling the size of the group.  Through the state of N.Y. 10 to 20 people joined the march daily.  When the S.F. group walked across the George Washington Bridge they numbered about 300.  The groups on other march routs also grew over the 7 months.  On June 12, 1982, in Central Park Nipponzan-Myōhōji marchers from the U.S.A., Europe, Africa, and Asia, joined with mobilization for survival organizers and religious and peace groups from around the world in a peaceful demonstration for disarmament of many million people.

Zapata (lithograph): Zapata (1932) is a lithograph by the Mexican artist Diego Rivera (1886–1957) that depicts the Mexican revolutionary Emiliano Zapata (1879–1919) as he holds the reins of a horse among a group of "campesinos" (peasants).  The lithographic edition was created and printed twelve years after Zapata's assassination.  Zapata is based on Agrarian Leader Zapata (1931), one of eight "portable" frescoes produced explicitly for Rivera's solo exhibition at the Museum of Modern Art (MoMA) in 1931, which was adapted from his previous "Revolt" panel from a fresco titled "The History of Cuernavaca and Morelos" (1929–30) painted in the Palace of Cortés, Cuernavaca.  There were 100 original prints of the lithograph, many of which are in the collections of various art museums.

This Is Me (Misia song): "This Is Me" is a song by Japanese recording artist Misia taken from her tenth studio album, "Soul Quest", for which it serves as leading track.  On June 26, 2011, a snippet of the song was released on Misia's official website.  The full song was released as a promotional single on July 13, 2011 and made available as a pre-order bonus for people who pre-ordered "Soul Quest" through the Japan iTunes Store.

Laura (Bat for Lashes song): "Laura" is a song by English recording artist Bat for Lashes for her third studio album "The Haunted Man" (2012).  It was written by Natasha Khan and British songwriter Justin Parker.  It received positive reactions from fans when Khan played it at a string of European festival dates.  The song received its radio debut on 22 July 2012 on Zane Lowe's BBC Radio 1 show as "Hottest Record in the World" and was made available as an instant download to people who pre-ordered the album on iTunes.

Robert E. Lee Monument (Richmond, Virginia): The Robert E. Lee Monument was the first and is the largest of Monument Avenue's monuments in Richmond, Virginia.  In 1876 the Lee Monument Association commissioned the adaption of a painting done by artist Adalbert Volck into a lithograph.  The lithograph, depicting Lee on his horse, was the basis for the bronze statue created by French sculptor Antonin Mercié.  (The horse was not Lee's favorite wartime horse, Traveller, as some believe.)  The cornerstone was placed on October 27, 1887.  The statue was cast in several pieces separately and then the assembled statue was displayed in Paris before it was shipped to Richmond, where it finally arrived by rail on May 4.  Newspaper accounts indicate that 10,000 people helped pull four wagons with the pieces of the monument.  The completed statue was unveiled on May 29, 1890.  The statue serves as a traffic circle at the intersection of Monument Avenue and Allen Avenue (named after Otway Allen, the developer who donated the land to the association).  Lee stands 14 ft high atop his horse and the entire statue is 60 ft tall standing on a stone base.

By the People, for the People: By the People, for the People is a compilation album by American heavy metal band Mudvayne.  It was released on November 27, 2007 by Epic Records.  The album features a track listing chosen entirely by the band's fans, with the band determining which version appears on the record (e.g. live, demo, acoustic), as well as two new songs, "Dull Boy" and a cover of The Police's song "King of Pain" (both produced by Dave Fortman).  If the album was pre-ordered through the Sony Music Store, it was packaged with a free lithograph of the lyrics to "Dull Boy", signed and numbered by Mudvayne vocalist Chad Gray.  If it was ordered after the disc was released, the lithograph was shipped approximately three weeks later and was neither signed nor numbered.

List of minor planets: This is a list of numbered minor planets in the Solar System, in numerical order.  s of 2017 there are 496,815 numbered minor planets, and 237,441 unnumbered.  Only 21,009 or approximately 4% of all numbered minor planets are currently named, mostly for people and figures from mythology and fiction.  The Jupiter trojan is currently the lowest-numbered unnamed minor planet.  Minor planets also include dwarf planets of which 5 have been officially recognized by the IAU with potentially hundreds more to follow in the future.

Chad Gray: Chad Gray (born October 16, 1971), is the lead vocalist for the groove metal supergroup Hellyeah and former lead vocalist for American heavy metal band Mudvayne.

Museum of Consciousness: Museum of Consciousness is the fifth studio album by Shpongle, released on 29 July 2013.  A snippet of the album's early form was shown in a YouTube video by Simon Posford.  Songs from the album became part of Shpongle's live shows in 2012.  The album was announced in May 2013 via Shpongle's Facebook page, and more details were revealed in June on Twisted Records' website.  The album was released early on 24 July 2013 for people who pre-ordered, and on 29 July to the general public.

Supporting paragraphs: By the People, for the People Chad Gray
Answer: Hellyeah