Rigoletto - prelude and Aida - prelude on YouTube
"Rigoletto - prelude to Act.1" and "Aida - prelude to Act.1" with Berlin State Opera Orchestra on YouTube
These recordings were released on 78rpm in 1923 or 24. Not released on CD.
Erich Kleiber, Verdi 'Rigoletto' Preludio
Erich Kleiber, Verdi 'Aida' Preludio