The band was formed by at-the-time already prominent musicians Janez Bončina (vocals), Tihomir "Pop" Asanović (organ), Petar Ugrin (trumpet, violin), Ratomir "Ratko" Divjak (drums), Karel "Čarli" Novak (bass guitar) and Braco Doblekar (saxophone, percussion).

September was formed in Ljubljana in 1975 by organist Tihomir "Pop" Asanović and vocalist Janez Bončina, both of them already prominent figures on the Yugoslav rock scene.

[1] Bončina, who, for a period of time, played for Yugoslavia national under-21 football team, formed his first band, Helioni (The Helions) with Tomaž Domicelj, who would later rise to fame as a singer-songwriter.

[1] Benčina graduated from the Ljubljana Academy of Fine Arts and for a period of time wrote about rock music for various magazines.

[1] Besides Asanović and Bončina, the first lineup of September featured trumpeter and violinist Petar Ugrin, drummer Ratomir "Ratko" Divjak, bass guitarist Karel "Čarli" Novak and saxophonist and percussionist Braco Doblekar, all of them already prominent names of Yugoslav music.

[1] He was previously a member of Mladi Levi and Jugoslovenska Pop Selekcija and performed with Korni Grupa on their 1972 concert at the Montreux Jazz Festival.

[1] Divjak was a student of the Graz University of Music and Performing Arts and a former member of the bands Dinamiti, BP convention and Time.

[1] Doblekar was formerly a member of The Generals, Srce, Pro Arte and Jugoslovenska Pop Selekcija, and had also played with RTV Ljubljana Big Band.

[1] On 7 May 1976 the band performed on a concert in Studio M in Novi Sad alongside Korni Grupa, Drago Mlinarec, Tomaž Domicelj and Time.

[1] At the end of 1977 Ugrin, Divjak and Novak left the band due to their obligations towards RTV Ljubljana Dance Orchestra.

[1] With the introduction of guitar into the band's lineup, the sound had moved away from jazz towards hard rock and funk influences, and several songs featured polyphonic singing.

[1] After the album release, the band started making plans for another United States tour, but unexpectedly decided to end their activity.

[3] With his wife, actress Damjana Golavšek (former member of the folk rock band Kladivo, Konj in Voda) he recorded the albums Rime (Rhymes, 1995) and Nasmeh (A Smile, 1999).

[3] He released jazz-oriented solo album Mir, prijateljstvo, ljubezen (Peace, Friendship, Love) in 1996 and produced works by other artists.

[3] In 2003 the compilation album The Best of September was released, followed by the band's reunion in the lineup that featured Janez Bončina (vocals), Tihomir "Pop" Asanović (organ), Braco Doblekar (percussion), Marijan Maliković (guitar), Jadran Ogrin (bass guitar), Ratomir "Ratko" Divjak (drums) and Tulio Furlanič (drums, vocals).