Their music can be described as guitar-based singer-songwriter rock or folk-rock. It ranges from very delicate and intimate singer-songwriter songs to songs that are stronger, more active and louder. Sarah's smoky, enigmatic voice is the band's best known characteristic. In the seven years between The Great Subconscious Club and Almost Happy the music changed from raw and guitar-based to a more subtle and delicate sound. Sarah and Gert write most of the music and lyrics. Most of it is written separately.

Sarah mainly tries to express ideas in her songs, and has a hand in writing silly and tongue-in-cheek songs. Gert has one big theme: losing the one you love. While most of the songs are easily accessible and open, some others are strange and incomprehensible. This led Sarah to comment: "Listening to the lyrics in the first time, you may find it hard to understand their meaning. When you listen to them a second time you may sense a basic truth in these cryptic words. If you do so, please let me know."

This band appeared in an episode of Buffy the Vampire Slayer (Doppelgangland) with the song Virgin State of Mind, leading to a boost in popularity.Their most popular song 'Not an addict' can be heard in the movie 'Wild things'.

The band is currently separated while the band members work on solo projects. Sarah Bettens has released an album under her own name, while Gert has released a solo album as Woodface. In an interview with OuiFM, Sarah stated, 'I don't want to say that this is the end of K's Choice', and, 'my brother and I will continue to make music together.'