His two brothers are Balázs and fellow X-Faktor contestant and winner Csaba Vastag.

[1] In 2010, he and his brother Csaba participated in the first season of the X-Faktor, the Hungarian counterpart of the X Factor.

In autumn of 2011, fellow Hungarian singer Ildikó Keresztes featured Tamás in her song Hátha lehet még in the album A démon, aki bennem van, along with Norbert L. Király and Nikolas Takács.

In late 2012, Tamás Vastag was announced to participate in the 2013 edition of A Dal, the Hungarian national selection for the Eurovision Song Contest.

Chosen to sing again in the 2nd heat, Tamás was eliminated, with only 35 points, being beat out by fellow contestant Bogi.