featured Brian's wife Marilyn on lead vocal. Only four songs have been documented as being recorded at Caribou: "Battle Hymn of the Republic", "Good Timin'", "Brian's Tune" ("Ding Dang"), and "Child of Winter". In November, Mike Love told Melody Maker that the band had completed "about 40 tracks" and that their next album would be completed by January 1975. Love reported, "Brian is very involved with the LP. ... The album's a combination between Sunflower and Holland. It's got some of the feel that Holland had, but also sounds a bit like Sunflower in certain respects." The material was written by himself ("about ten" of the songs), Brian (five), Carl and Dennis ("about five" each), and Jardine ("a couple"). The group completed a few tracks from these sessions, including "Child of Winter", but ultimately abandoned most of them. Released as a single at the end of December 1974, "Child of Winter" was their first record that displayed the credit "Produced by Brian Wilson" since 1966. Interim and Beachago tour (1975) With the project put on hold, the Beach Boys spent most of the next year on the road playing college football stadiums and basketball arenas. Early in 1975, Wilson signed a short-lived sideline production deal with former Beach Boy Bruce Johnston and producer Terry Melcher's Equinox Records. Together, they founded the loose-knit supergroup known as California Music. Wilson produced their covers of "Jamaica Farewell" and "Why Do Fools Fall in Love?", but his participation in the group soon ended. Over the summer, the touring group played a co-headlining series of concert dates with Chicago, a pairing that was nicknamed "Beachago". The tour was massively successful and restored the Beach Boys' profitability to what it had been in the mid-1960s. In a July 1975 article for NME, Nick Kent reported that Carl Wilson had cited "Rollin' Up to Heaven" (retitled from "Ding Dang"), "California Feelin", and "Good Timing" as "titles to new Brian Wilson songs recorded for the next Warner/Reprise album". Carl told Kent that the new songs demonstrated Brian's new "funky" approach. In September, the band recorded a version of the Del-Vikings' "Come Go with Me", but the track was ultimately left off 15 Big Ones. In October, Wilson recorded a rendition of Van Dyke Parks' "Come to the Sunshine", also intended for the band's forthcoming album, but a dispute prevented the track's inclusion. Although another joint tour with Chicago