What is define jaded heart?

As an AI language model, I cannot have an opinion on music, but I can give information.

Jaded Heart is a German heavy metal band that was formed in 1991 in Duisburg. The band's style is described as a mixture of hard rock and heavy metal, with a focus on catchy melodies and powerful guitar riffs. Throughout their career, Jaded Heart has released over 10 studio albums and has toured extensively, both in Europe and internationally. Some of their most popular songs include "Love Is a Killer," "Healer," and "Paid My Dues." The current members of the band are Johan Fahlberg on lead vocals, Peter Östros on guitar, Masahiro Eto on drums, and Michael Müller on bass.