There are two bands under this name:

1) Letzte Instanz, founded in Dresden, Germany in 1996, is a German rock band particularly noted for their use of the violin and cello. The founding members included Hörbi, Tin Whistle, Muttis Stolz, Kaspar Wichman, Holly D. and Markus G-Punkt. Benni Cellini and Robin Sohn (Sebastian Lohse) entered the group a year later. To date, they have released six studio albums, one live album, a live DVD, two singles, and have appeared on a number of mix CDs. Since "Ins Licht" (2005) Letzte Instanz have a new singer called Holly (not Holly D!).

2) Letzte Instanz, a RAC band from Germany.
They've released a split CD "Ruhe Vor dem Sturm" with gnadenlos. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.