Why not listen to Natalie Dessay ?
I am glad to start this page suggesting: classical music .
I am very fond of the Natalie's interpretation of Mozart as for example:.

• 'Se tutti i mali miei'
• No, che non sei capace'
• 'Vorrei spiegarvi, oh dio!

which I highly recommend, but also something you can listen to on the net will do.
Just some suggestions

• Lakmé - "Air des clochettes or
  
• Queen of the Night
• Lakmè. The Bell Song

Do you prefer other sopranos?
What about Maria Callas 's ?

• Casta Diva
• or in a different version

Also some religious piece is really worth listening

• Schubert's Ave Maria
• Schubert's Ave Maria Latin Version
• Veni Creator Spiritus - Gregorian Chant