As a Decca Records artist, the band began to open for such bands as The Kinks, Iron Butterfly, Yes, Traffic, Grand Funk Railroad and Chicago. Contrary to the tight production and song-oriented nature of Glass Harp's studio albums, their live performances demonstrated the band's ability to stretch out and expand the boundaries of their compositions. As a result, they are one of the pioneers of what would later be known as the jam rock genre, with songs many times reaching over 30 minutes in length with extended solo passages and group improvisation.