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For just orchestral these are nice:

Wagner - Norrington - Siegfried-Idyll - Part 1/2 - YouTube

Gustav Mahler - Adagietto from Symphony no. 5 - YouTube
...

Here are a few from opera - you can find other singers doing the same arias on the side.
Kiri te Kanawa - O mio babbino caro - Puccini - YouTube
Final scene of "La Bohème" - Part 1 - YouTube...

Love the Barber of Seville choice. i don't ever listen to music while shaving, but if I did I think Goldberg vatiations with Kenneth Gilbert would be good. I'd also like to try some arias from La...