Capriccio translates to "whim" or "caprice". It's a charming and slightly old-fashioned word that evokes a sense of playful impulsiveness or a sudden, often irrational, desire.
While not explicitly in the provided lyrics, the song title itself, "Capriccio", sets the tone. It suggests the singer's urgent and perhaps slightly unreasonable desire for his beloved to come down and be with him, highlighting the whimsical and passionate nature of young love. It's a word that hints at a delightful, if a bit demanding, romantic mood.