Mon sai is a band from Fagersta, Sweden, formed in 2013. The band consists of Amadeus Rudolfsson, Fredrik Liljeqvist, Simon Kilström and Johan Holmqvist.
They met already during high school in 2009, where they came to be united by the music. Since then they've been part of bands such as Supply us with Balloons, Siberian Circus, Costume Kids and Bobby gräs. Although it wasn't until the summer of 2013 that they finally formed Mon sai.