drones ;  surreal , whimsical, esoterically or literary-inspired, lyrics;  ] a strong emphasis on extended instrumental  solos  or  jams ;  electric guitars, often used with  feedback ,  wah wah  and  fuzzboxes ;  ] a strong keyboard presence, especially  organs ,  harpsichords , or the  Mellotron  (an early tape-driven 'sampler');  elaborate studio