The Flower Kings are a Swedish progressive rock band formed in 1994 by guitarist and singer-songwriter Roine Stolt. The group began as Stolt's touring band to support his third solo album The Flower King. They continued performing after the tour and have gone on to become one of the most prolific studio recording units in progressive rock, having released over twenty hours of music spread across sixteen studio albums. Their music is similar to early symphonic progressive rock groups such as Yes, marked by sharp dynamic changes, polyrhythms, heavy bass, vocal harmonies, abstract lyrics, and extended song lengths.