 The main reason for their return was the forthcoming public celebrations of the Prince of Orange's coming of age.Wolfgang had composed a quodlibet (song medley) for small orchestra and harpsichord, entitled "Gallimathias musicum", K. 32, which was played at a special concert to honour the Prince on 11 March.This was one of several pieces composed for the occasion; Wolfgang also wrote arias for the Princess using words from Metastasio's libretto "Artaserse" (including "Conservati fedele", K. 23), and keyboard variations on a Dutch song "Laat ons juichen, Batavieren!"