Each of these clues is very difficult to solve without more information. However, each clue answer has the property that it is entirely composed of solfège notes, except for a single additional letter. Moreover, each clue is uniquely paired to one of the pieces of music, where the notes in the music correspond to the solfège notes, and the location of the rest indicates the additional letter. The answers to the clues are:
Reading the additional letters in each answer spells out LONGEST ABBA SONG, which clues EAGLE, the answer.