By the mid-1960s, he had become a far stronger vocalist and an accomplished live performer, and following his masterly lead on "God Only Knows" in 1966, was often featured as lead vocalist for the band (a role previously dominated by Mike Love and Brian Wilson), singing many leads on the Smiley Smile and Wild Honey albums, including the hit singles "Good Vibrations," "Darlin'," and "Wild Honey," then on 1969's "I Can Hear Music," which served as Carl's first major studio production. After his elder brother Brian's retirement from the stage in 1965, Carl became the de facto leader of the band onstage (contracts at that time reading that promoters hired 'Carl Wilson plus four other musicians'), and shortly after became the band's in-studio leader, producing the bulk of the albums 20/20, Sunflower, Surf's Up, Carl and the Passions - "So Tough" (named in honour of his effective leadership of the band at this point) and Holland. With the exception of the uneven "So Tough", these albums are now generally considered among the band's best, both by fans and critics.
In 1967, Wilson also made headlines as a conscientious objector to the Vietnam War, at one point having to let the rest of the band tour the UK without him while he was up before the draft board.
Never a prolific songwriter, Wilson's first solo composing contributions to the band, other than a handful of early surf instrumentals, came with 1971's Surf's Up, on which he composed "Long Promised Road" and "Feel Flows" to lyrics by the band's then manager Jack Rieley. He had earlier been given cowriting credits on a few songs, but these appear to have been for arrangement ideas contributed to others' songs - he considered "Long Promised Road" his first real song. On the immediately following Beach Boys albums he would average one or two songs, cowritten with various lyricists or other members of the band. Carl's leadership role in the band diminished somewhat in the late '70s, both due to Brian's brief reemergence as the band's producer and substance abuse problems. He nonetheless remained a prominent and recognizable voice in the band, taking lead vocals on many songs and serving as "mixdown producer" on the Brian-produced Love You album.
By the time of recording of 1979's L.A. (Light Album), Carl had overcome his drug problems and again found himself filling the vocal and songwriting gap left by a retreating Brian Wilson. A song he wrote with Brian in 1974, "Good Timin'", was a Top 40 American hit from that album, and features a rare Brian-like lead falsetto line from Carl (despite Carl's impressive range, he generally sang low midrange harmony in the band's vocal arrangements). The song and its soaring vocal are considered to be a late period high point for the band.
During the 1970s Wilson also produced records for several other artists, notably Ricci Martin (son of Dean Martin, not to be confused with the late-'90s pop star) and South African group The Flame (two members of whom went on to be members of the Beach Boys for a couple of years, before becoming successful musicians performing with people like The Rutles, Bonnie Raitt and the Rolling Stones). He also occasionally appeared on others' records as a backing vocalist, most notably appearing on Chicago's Wishing You Were Here (with brother Dennis Wilson and bandmate Alan Jardine). He is widely regarded to have had one of the finest voices in rock and his voice appears as a backing vocal on many recordings by groups and solo singers. Examples include Chicago's hit "Baby, What A Big Surprise", Elton John's "Don't Let The Sun Go Down On Me" (with then former-bandmate Bruce Johnston) and David Lee Roth's hit cover of "California Girls."
He released a solo album, Carl Wilson, to little critical notice, in 1981, made up of songs co-written with Myrna Smith-Schilling (former backing vocalist for Elvis Presley and Aretha Franklin and wife of Wilson's then manager Jerry Schilling). He also undertook a solo tour to promote the album that same year, the first member of the band to do so (not counting Mike Love's various side projects in the late '70s).
He recorded a second solo album, Youngblood, in a similar vein, but by the time it was released in 1983 he had already rejoined the Beach Boys, and some have suggested that the line "If I could talk to Love I'd say/'Have it your way, Love, have it your way'" in the song "If I Could Talk To Love" on that album might have been more about his bandmates than the emotion.
Although Youngblood did not chart, a single, the John Hall-penned "What You Do To Me," did, making Carl only the second Beach Boy to land a solo single on the Billboard chart. Carl frequently performed that song and "Heaven" from the 1981 album at Beach Boys concerts in the '80s, the latter being cast as a tribute to brother Dennis after his death in December 1983.
He still remained an important part of the band as a performer, singing lead on the chorus to the band's last big success, 1988's US number one "Kokomo", but except for his vocal and songwriting contributions to the band's 1985 eponymous comeback album, widely regarded as that record's saving grace, saved his songwriting and production for home recordings. He carried on touring with the band until the last months of his life.
Carl Wilson lost his battle with cancer on Friday, February 6, 1998, just two months after the death of his mother, Audree Wilson. He was survived by his brother Brian, wife Gina (daughter of Dean Martin), and two sons by his first marriage, Justyn and Jonah.
A handful of recordings of Wilson have been released - notably the album Like a Brother, by a 'supergroup' Wilson formed with Gerry Beckley of America and Robert Lamm of Chicago. He also appeared posthumously on his brother Brian's album Gettin' in Over My Head, which used his vocal from the unreleased Beach Boys song "Soul Searchin'" put to a new backing track. He also appears on the many Beach Boys archival releases that have come out since his death.