"Happyendless" was formed in 1999.At the beginning of their career, Happyendless won every possible Lithuanian music award, and in 2008 they were officially named the best band in the Baltic States at the MTV European Music Awards.In 2008, Happyendless released the album Room For Mistakes, and in 2012 they released CINEMA.In 2012, Happyendless vocalist Saulius Prūsaitis launched his solo career. Andrius Kauklys and Marius Narbutis stopped the band's activity and devoted their time to various musical projects, creating soundtracks for films and commercials. 
In February 2018, after a few years of creative break, Happyendless returned with their third album "KINETIKA".
Andrius Kauklys and Marius Narbutis worked on the Sel album "Guma", the musical project "Bears", the song "3 Milijonai", which is considered to be the national anthem of sports, the music for "Akvariumas", the reality show "Dangus", the soundtracks for the films "Zero", "Zero 2", "Zero 3" and "ZERO Live Show", and also for a number of short and animated films. In 2010, Happyendless was awarded the Silver Gerve for the soundtrack of Zero 2. 
After several years of creative silence, Happyendless returned to the Lithuanian music world with the album KINETIKA and a new idea - to blend electronica with jazz, hip-hop, folk, and other styles unusual to this kind of music, and to record the tracks with a different vocalist. The album, presented in February 2018, features the voices of Giedrė Kilčiauskienė, Kastytis Sarnickas (G&G Sindikatas), Vaidas Baumila, Kamilė Gudmonaitė (Kamanių šilelis), Kamilė Tumelytė-KAIA, Model Citizens, and Tautmilas Čeidos-Kamy.