Tellervo has been writing music for her band Olento Orchestral since 2015.

On 26 September 2025, Olento Orchestral released their second album Kattokruunun alla, with cover artwork by Mirka Raito.

In 2022, they released the album Anatomia, featuring cover artwork by Niina Lehtonen Braun.

Both albums are available on Bandcamp.