Keyboardists he has listed as his favourites include Kevin Moore, Jon Lord, Jens Johansson and Matt Guillory.

He has also recently started a melodic death metal side project called Graveyard Shift as vocalist with his former Sonata Arctica bandmate Jani Liimatainen.

[1][2][3] Sonata Arctica chose Klingenberg to join after spending time drinking with him and another candidate, since they wanted the newcomer to fit in with the other band members' socially as well as musically.

[1][2][3] During live shows, Klingenberg's keytar allows him to add more energy and movement to the band's performances and he often wanders the stage whilst playing, in the same way that guitarists often do.

[1][2][3] In the documentary Men of the North in the Land of the Rising Sun, Klingenberg is shown wearing a traffic cone on his head, which has become a trademark of sorts for fans.