Schwartzkopf singing Shubert's Four Last Songs; the blues riff Jimi plays right after Purple Haze on the Woodstock soundtrack; anything by Kate Bush, but especially her earliest works, including "The Man With The Child In His Eyes," "Wuthering Heights," "L'Amor Looks Something Like You".... I share many of the prior choices as well, but what's the point of mentioning yet again Tchaikovsky's Violin Concerto? :-)