From an early age Lampert showed interest in music, taking singing and accordion lessons at a local art centre in his hometown of Chorzów. On 14 December 1997, he became the winner of a popular Polish TV show Szansa na sukces (A Chance for Success), a reality television-music competition series on Polish public television. A year later he formed the short-lived boy band Boom Box, with which he recorded two LPs, "Boom Box" and "Czysta energia" (Pure Energy). He appeared on the Szansa na sukces again, also winning on 12 July 1998 (this episode regularly scheduled airing was on 6 September 1998), then on a special show whose theme were European hits on 8 May 2004, then again, in a Valentine special singing opera on 12 February 2006, singing La donna è mobile from Giuseppe Verdi's opera Rigoletto. His another appearance on that show was in a retrospective on 5 November 2006, singing a song (Dni, których nie znamy - Days We Yet Don't Know) by a Polish singer/songwriter Marek Grechuta who had just died, on 9 October 2006. Another special appearance of Lampert's on that show was on 23 September 2007, for its 15th anniversary celebration, then another operatic episode on 1 November 2007 where he sang Giovanni Capurro and Eduardo di Capua's "O Sole Mio". On 25 October 2009 the show paid tribute to Michael Jackson who died four months earlier. Andrzej Lampert appeared again, covering Jackson's "Billie Jean", and "I Just Can't Stop Loving You" in a duet.
With Hania Stach recorded two songs to Disney Channel movie "High School Musical 2".
- High School Musical 2 - You are the music in me (Polish: Moja muzyka to ty), Every day (Polish: Masz w sobie wiarę)
- Cars - song performing in trailer (only DVD version)
- Brother Bear - vocal part