Rexroth was hired by Pamela Rosenberg for his debut at the Staatsoper Stuttgart with Purcell's King Arthur in 1999 [REF].
Also in 2000, Rexroth won two competitions, both wins as first countertenor ever: the 37th Francisco-Viñas in Barcelona - first prize in the category Male voices, as well as 'best counter-tenor'[REF] and the 19th 'Hans Gabor Belvedere Singing Competition' in Vienna, winning the first prize and eight additional prizes [REF].