4Lyn was a rock band from Hamburg, Germany. 4Lyn began their career as Headtrip in 1995 as high schoolers. They recorded demos and played locally, and in 2000 a gig at the Ohrenschmaus Festival in Hamburg got them attention from label scouts. "4Lyn" is an acronym of sorts; 4 is the number of band members, and LYN stands for "Little Young Nasties".
They released their debut self-titled record on Universal Records subsidiary Motor Music in 2001, and toured with Papa Roach, Thumb, Therapy?, Cosmotron, and Dredg. They recorded their sophomore effort, Neon, in Denmark, then toured throughout central Europe. They left Motor Music to sign with Edel Music for their third release, Take it as a Compliment, issued in 2004. In 2005 they wrote a theme song entitled "Go Sea Devils" for the Hamburg Sea Devils, a football team. 2007 saw the release of their self-produced album, Compadres.
In January 2008, the band released the album Hello. Then, as a gift to loyal fans, the band released a live album, Live In Hamburg, which could only be purchased through the band's official website (which had gone offline since their breakup; the band's official Facebook page has taken over as their main website).
In May 2008, a statement on the band's official website confirmed the departure of Rene Knupper, who left the band to pursue "other life experiences". The departure was amicable and he remains friends with the band. Dennis Krüger then joined the band full-time as lead guitarist.
Their latest album Quasar was released in May 2012.
In 2013, a statement posted in German on the band's official website confirmed that the band had decided to part ways permanently. The band played a number of farewell shows that year, and changed their Facebook profile image to a band logo with the numbers 1998–2013 underneath.