There are 3 artists with the name Gustav: Gustav (Eva Jantschitsch) is a one woman band from Vienna, Austria who makes music for movies, theater and ipods with her laptop and an assortment of instruments she plays. She uses a multitude of languages including French, German, and English. She has released her second album in May 2008.
More info: gustav.me Gustav (Pascal Vonlanthen) is a chansonier from Switzerland singing in german and french. He released 5 albums for the most part together with different bands/orchestras.