Karol XVII and MB Valence

Karol XVII and MB Valence is a Polish house duo composed of Karol Samocki and Marek Bigajski. The pair co-founded digital label Loco Records in 2007 and began releasing music under their collaborative project in 2009. They also record under the alias Jackspeare.

The duo produces deep house, house, and minimal/deep tech tracks that span from 2009 to 2012 across seven documented releases. Their sound operates within the deeper spectrum of house music, incorporating soulful elements alongside minimal techno influences. The partnership between Samocki and Bigajski focuses on groove-oriented productions that balance underground sensibilities with dancefloor functionality, positioning their work within Poland's house music scene during the early 2010s.