Theodorus Josephus Jan Nabuurs (born 14 February 1965), better known by his stage name Mental Theo is a Dutch record producer and DJ. He has recorded two studio albums: Back Once Again (2005) and Jumpstyle Madness (2007). He also performs in duo with Charly Lownoise.^[1]

Mental Theo was born in 's-Hertogenbosch, Netherlands.^[2] In 2005 his first solo studio album Back Once Again was released. The album peaked at number 61 on the Dutch albums chart.^[3] In 2006 Mental Theo re-recorded "Boten Anna" by Basshunter and it was released under the name "Now You're Gone" and alias Bazzheadz.^[4][5] The single charted at number 18 on the Danish singles chart.^[6] Initially Basshunter tried to translate "Boten Anna" to English for few times^[7] but it was impossible to translate so in 2007 he made his version of "Now You're Gone" featuring DJ Mental Theo.^[8] Single was released on 29 December 2007.^[9] It was the initial release for Hard2Beat Records label (later Dance Nation).^[10] The single charted at number 1 in the United Kingdom, where it stayed at the top for five weeks.^[11] It was the first Swedish song at number one on British list since "Dancing Queen" by ABBA.^[7] It sold an excess 667,000 copies in the United Kingdom^[12] and was certified platinum.^[13] It also charted on UK Top 100 Songs of the Decade.^[14] "Now You're Gone" also stayed at the top for five weeks in Ireland, made it to number 2 on the Swedish chart,^[15] and number 3 in New Zealand (single was certified platinum^[16]).^[17] On the French singles chart, "Now You're Gone" peaked at number 6.^[18] "Now You're Gone" also charted at number 4 on the European Hot 100 Singles.^[19] His 2007 second solo studio album Jumpstyle Madness charted at number 51 on the Dutch albums chart.^[20] The next single "Say You'll Stay" with Bazzheadz alias was released in 2008 and reached number 21 on the Dutch singles chart.^[21]