He started his musical career in 1980. in the "Social" group. In 1987-1988, he played drums in the Šiauliai Television Factory ensemble. in 1988 joined the band Bix, where he still plays drums.

in 1993 elected the best Lithuanian instrumentalist in the "Bravo Music Awards".
In 2016, he started his solo project.
G. Gascevičius' solo album "FonoGrafijos" was evaluated as one of the most conceptual of 2017. released albums.

The artist's work of the year 2018 is the CD album "Varava".

In 2020, the third solo album "Oneirology" was released (Greek: oneiros - dream, logos - science). This is the third part of the trilogy.

The fourth - Faust - was published in 2021. This is the soundtrack of the performance mono play "Faust". G. Gascevičius played the main role in the play. Director Lina Peleckienė - Jankauskaitė.

Recorded more than 30 music albums with various musical groups.