His next underground album Alternatywne źródło energii (Alternative Energy Source) was released in 2010, which helped Medium to be spotted by Marcin "Tytus" Grabski, CEO of Asfalt Records, who offered him a contract.

On 22 November 2011 Tau released his official debut album (performing as Medium) titled Teoria równoległych wszechświatów (The Theory of Parallel Universes), which, despite slight promotion, sold over eight thousand copies in Poland.

[5] The album Księga słów (The Book of Words) was released on 28 June 2013 in a limited number of copies.

[8][9] On 10 August 2015 Tau posted a picture on his Facebook profile with a caption that he had finished making a new album.

In December 2018, he posted a message saying that the album would be named Egzegeza: Księga pszczół (Exegesis: The Book of Bees) and presented its cover.