Traffic : began as a psychedelic rock group .
Traffic : diversified their sound through the use of instruments such as keyboards like the Mellotron and harpsichord , sitar , and various reed instruments , and by incorporating jazz and improvisational techniques in their music .
Traffic : began as a psychedelic rock group and diversified their sound through the use of instruments such as keyboards like the Mellotron and harpsichord , sitar , and various reed instruments , and by incorporating jazz and improvisational techniques in their music .