Tau - Topic

Piotr Kowalczyk, better known under his stage name Tau, and formerly as Medium, is a Polish rapper, singer and record producer. In 2008, he released his underground debut album Seans spirytystyczny under the name Medium. His next underground album Alternatywne źródło energii 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 titled Teoria równoległych wszechświatów, which, despite slight promotion, sold over eight thousand copies in Poland.
In 2012, Tau announced that he had converted to Christianity. A few months later he released his second album Graal. The album was highly criticized by many reviewers due to its radical lyrics. In 2013, Medium and producer Galus formed a one-album-group Egzegeza. The album Księga słów was released on 28 June 2013 in a limited number of copies.
On 6 December 2013 Medium announced that he had changed his pseudonym to Tau due to the fact that his name Medium may have been seen as connected to mediumship practice, which is in opposition to Christian philosophy.