Describe the key characteristics of psychedelic rock, including its musical and lyrical themes, and identify leading artists of the era.

Psychedelic rock, emerging in the mid-1960s, was a genre characterized by its exploration of altered states of consciousness, experimentation with unusual sounds and structures, and a rejection of traditional song forms. The music and lyrical themes were often designed to evoke a sense of euphoria, disorientation, and transcendence, drawing heavily on the influence of hallucinogenic drugs and Eastern spirituality. Musically, psychedelic rock was marked by several key features. One of the most prominent characteristics was the use of unconventional instrumentation. While electric guitars, bass, and drums were still the core of the band, psychedelic rock often incorporated instruments not typically found in rock music, such as sitars, mellotrons, and theremins, which were employed to create otherworldly and ethereal textures. The use of electronic effects, such as phasing, flanging, reverb, and distortion, was also common, manipulating and warping the sounds of traditional instruments. Bands experimented with different sonic textures to try and mimic or suggest altered states of perception. The overall sound of the music was often characterized by a layered, dense, and sometimes chaotic texture, as instruments were often used in unconventional ways. Song structures in psychedelic rock tended to be less linear and more improvisational compared to earlier forms of rock. The traditional verse-chorus structure was often abandoned in favor of extended instrumental passages, free-form jams, and experimental arrangements. The songs might feature abr....