Sunshine's greatest success was solo singer Normie Rowe, who scored a string of major Australian hits between 1965 and 1968, and his double-A-sided 1965 single "Que Sera Sera" / "Shakin' All Over" became one of the biggest-selling local hits of the 1960s and is still one of the biggest selling Australian singles of all time. The Sunshine roster featured several male solo singers including Normie Rowe, Peter Doyle (who later joined The Virgil Brothers and The New Seekers) and Mike Furber. Its more 'left field' signings included hardcore Brisbane blues-R&B band The Purple Hearts, highly rated NZ pop/R&B group The Librettos, Tony Worsley & The Fabulous Blue Jays, Normie Rowe's backing band The Playboys, Marcie Jones & The Cookies, highly rated Sydney teen singer Toni McCann, renowned surf band The Atlantics, Ricky & Tammy, Melbourne's feedback kings Running Jumping Standing Still, NZ folk duo Bill & Boyd, Rev. Black & The Rockin' Vicars, popular Brisbane solo star Jonne Sands and Brisbane pop band Wickedy Wak, whose Sunshine single "Billie's Bikie Boys"—the recording debut of future star Rick Springfield—was produced by Ian "Molly" Meldrum. Many earlier Sunshine recordings, including most of Rowe's early singles and albums, were produced by Nat Kipner, but in late 1965 Kipner sold his share in Sunshine and the Sydney Bowl nightclub. During mid-1966 Kipner collaborated with independent producer Ossie Byrne on the short-lived Downunder Records. During this period he briefly took over the management of The Bee Gees and persuaded Festival's Leedon label to release the band from their contract and signed them to the newly established Spin Records, which he had just joined as A&R manager. Following Kipner's departure, Pat Aulton took over as Sunshine's main producer, but both he and Kipner also produced recordings on Sunshine's short-lived sister label Kommotion, which was set up to promote the acts who appeared on the TV pop show of the same name. Aulton produced and engineered many later Sunshine singles and albums, as well as providing uncredited vocal and instrumental backing and contributing to arrangements. Sunshine Productions ran into serious financial problems around the end of 1966, but the full story behind the company's collapse is still not known. Pop historian Bill Casey has suggested that the financial strain of Normie Rowe's extended overseas stay was a contributing factor, but it seems likely that the main cause of the company's demise was Dayman's questionable business practices.