Let's get quizzical
I feel another music-based quiz coming on, but perhaps not first lines this time. I thought perhaps I'd do an Only Connect sort of thing: four cryptic clues pointing to song titles, and you have to find the link (and ideally the song titles themselves too). Starting with what I consider the most difficult:
1) Salicional, Vox Humana, Diapason
2) Which half of this bikini is which?
3) Schoolgirl could be famous conductor, we hear
4) 78% nitrogen, 21% oxygen, 1% other gases
Good luck. I like to think you'll enjoy it, and kick yourselves (being unable to reach me) when the answer is revealed. Unless you guessed it, of course.