Question: What documentary had music composed by the person who wrote "I'll Feel a Whole Lot Better"?

<P0-S0> "I'll Feel a Whole Lot Better" is a song by the Los Angeles folk rock band The Byrds, first released in June 1965 on the B-side of the band's second single, "All I Really Want to Do". <P0-S1>  It was also included on The Byrds' debut album, "Mr. Tambourine Man". <P0-S2>  Written by Gene Clark, who also sings the lead vocal, "I'll Feel a Whole Lot Better" features some of The Byrds' early musical trademarks, including Jim McGuinn's jangling 12-string Rickenbacker guitar; Clark's pounding tambourine; McGuinn, Clark, and David Crosby's complex harmony singing; and a country-influenced guitar solo. <SEP> <P1-S0>  It is narrated by Sonny Bono. <P1-S1> Marijuana is a 34-minute 1968 anti-drug documentary film by Max Miller and distributed by Avanti Films. <P1-S2>  It was described as "the first major film effort to center upon the use and possible risks of marijuana", in which "arguments for and against its use are presented and the accumulation of arguments against is allowed to speak for itself". <P1-S3>  Music for the documentary was composed by The Byrds' Gene Clark, a "bizarre" choice in his musical career, resulting in "meandering blues and pseudo-psychedelic instrumental jams". <SEP> <P2-S0> Harold Eugene "Gene" Clark (November 17, 1944 – May 24, 1991) was an American singer-songwriter and founding member of the folk rock band the Byrds. <P2-S1>  He was the Byrds' principal songwriter between 1964 and early 1966, writing most of the band's best-known originals from this period, including "I'll Feel a Whole Lot Better", "She Don't Care About Time", and "Set You Free This Time". <P2-S2>  Although he did not achieve commercial success as a solo artist, Clark was in the vanguard of popular music during much of his career, prefiguring developments in such disparate subgenres as psychedelic rock, baroque pop, newgrass, country rock, and alternative country. <SEP> <P3-S0> The Byrds' Greatest Hits is the first greatest hits album by the American rock band The Byrds and was released in August 1967 on Columbia Records ("see" 1967 in music). <P3-S1>  It is the top-selling album in The Byrds' catalogue and reached #6 on the "Billboard" Top LPs chart, but failed to break into the UK Albums Chart. <P3-S2>  The album provides a summary of The Byrds' history during Gene Clark and David Crosby's tenure with the band and also functions as a survey of the group's hit singles from 1965 to 1967, a period when the band had its greatest amount of success on the singles chart. <P3-S3>  Most of the band's U.S. A-sides from this period are included on the album, along with three of their more important album tracks: "I'll Feel a Whole Lot Better", "The Bells of Rhymney", and "Chimes of Freedom". <P3-S4>  The three U.S. singles from this period that are not included on the album are "Set You Free This Time", "Have You Seen Her Face" and "Lady Friend" (although these songs have been included as bonus tracks on various CD reissues of the album). <P3-S5>  All of the songs included on the original "Greatest Hits" album can also be found on the band's first four albums, "Mr. Tambourine Man", "Turn! <P3-S6>  Turn! <P3-S7>  Turn! <P3-S8> ", "Fifth Dimension" and "Younger Than Yesterday".