Question: Who is the leader of the group who sung California Dreamin'?

Context articles: The July 5th Album
California Dreamin' (disambiguation)
California Dreamin'
Michelle Phillips
California Dreamin' (film)
The Mamas &amp; the Papas
River City People
California Dreaming (TV series)
Royal Gigolos
California Dreamin' (All the Cleves Are Brown)

The July 5th Album is the second compilation album by American pop group The 5th Dimension, released in 1970 by Soul City.
 It is composed primarily of album tracks from amongst the group's four albums of original material for Soul City Records, many of which were B-sides to charting singles.
 It also includes one A-side single: the group's cover of The Mamas & the Papas hit "Go Where You Wanna Go".
 The song was originally intended to be the Mamas & the Papas first single but was replaced with the now-iconic "California Dreamin'".
 Choosing that single, and seeing it become successful, became something of a mixed blessing for The 5th Dimension, as they were frequently referred to in the media as "The Black Mamas & the Papas", a label the group sought to escape while creating their own unique identity.
California Dream, California Dreams, California Dreamin' or California Dreaming may refer to:
"California Dreamin is a song written by John Phillips and Michelle Phillips and was first recorded by Barry McGuire.
 However, the best known version is by The Mamas & the Papas, who sang backup on the original version and released as a single in 1965.
 The song is #89 in "Rolling Stone"'s list of the 500 Greatest Songs of All Time.
 The lyrics of the song express the narrator's longing for the warmth of Los Angeles during a cold winter in New York City.
Michelle Phillips (born Holly Michelle Gilliam; June 4, 1944) is an American singer, songwriter and actress.
 A native of California, she met and married John Phillips in San Francisco as a teenager, and went on to co-found the vocal group The Mamas & the Papas in 1965.
 The band rose to fame with their popular singles "California Dreamin'" and "Creeque Alley", both of which Phillips co-wrote.
 They released five studio albums before their dissolution in 1970.
 Phillips is the last surviving original member of the group.
California Dreamin' (endless) (Romanian: "California Dreamin' (nesfârșit)" ) is a 2007 Romanian film by Cristian Nemescu.
 It won the Prix un certain regard at the 2007 Cannes Film Festival.
 It also picked up the Iris Award for Best Film, the Audience Award and the Canvas Award at the Brussels European Film Festival 2007.
 The film is also sometimes called Endless in English, "nesfârșit" being Romanian for "endless".
The Mamas & the Papas were an American folk rock vocal group that recorded and performed from 1965 to 1968, reuniting briefly in 1971.
 The group was composed of John Phillips, Denny Doherty, Cass Elliot, and Michelle Phillips "née" Gilliam.
 Their sound was based on vocal harmonies arranged by John Phillips, the songwriter, musician, and leader of the group who adapted folk to the new beat style of the early sixties.
River City People were a folk rock quartet formed in Liverpool, England in 1986, by vocalist Siobhan Maher, guitarist Tim Speed, his drummer brother Paul Speed, and bassist Dave Snell.
 Siobhan, Tim and Dave had both been with Liverpool Band "Peep Show" until summer 1987 - at one point both bands co-existed.
 The group appeared on Channel 4's "The Chart Show" and soon afterward signed with EMI, releasing their debut single "(What's Wrong With) Dreaming?"
 in mid 1989.
 Their album "Say Something Good" followed a few months later, recorded in Los Angeles and produced by legendary producer Don Gehman.
 In the summer of 1990, the band scored their biggest hit with a cover of The Mamas & the Papas' "California Dreamin'".
 This was a double A-side with "Carry the Blame" .
 "This is the World" followed in late 1991, but the group disbanded shortly after.
California Dreaming is a British reality television series, broadcast on Channel 4's T4 Saturday morning programming block, that followed six British celebrities seeking success in Hollywood.
 They lived in a Hollywood mansion and were trained by doing challenges set by 'Acting Guro' Bernard Hillier.
 The programme's title came from the song "California Dreamin'" by The Mamas & the Papas.
Royal Gigolos were a German pumptech group, formed in late 2003 and dissolved in 2008 by the producers DJ Tyson and DJ Kosmonova with the vocalists Melanie and Jay, and later after 2008 with Lauren Dyson and Thorsten Kaiser.
 The group released successful dance cover versions of pop rock songs including "California Dreamin'" and "No Milk Today".
"California Dreamin' (All the Cleves Are Brown)" is the fifteenth episode of the fourth season of the animated comedy series "The Cleveland Show".
 The episode aired on March 17, 2013 on Fox in the United States.
 In this episode, Cleveland and his family pack their bags and move to Los Angeles, California to get new lives after Donna pulls some strings so he can pursue his dream of becoming a Major League Baseball scout for the L.A. Dodgers.
 Donna launches a career as a children's entertainer and the kids soon settle into the LA lifestyle, but Cleveland finds a new job isn't all it's cracked up to be.
 When he befriends struggling actress Gina, she helps him to realize that Hollywood isn't that glamorous as it seems.