Reddit reviews The 99 Most Essential Relaxing Classics (Amazon Exclusive)

Cheap bulk classical:

• The 99 Most Essential Relaxing Classics
  
• 99 Must-Have Chillout Classics
  
• The Greatest Classical Music Ever! 50 Best Relaxing Classical
  
  Lhasa:
  
  
• La Llorona
  
• The Living Road
  
• Lhasa
  
  Ambient 1/Music For Airports by Brian Eno

All of these are piano music, because that's what I perceive is played at salons.

Ravel: Jeux D'eau

Ravel: Pavane pour une Infante Defunte

Debussy: La Fille aux Cheveux de Lin

Satie: Trois Gymnopédies

Chopin: Many of his nocturnes (Check the comments for track listings)

Bach: Aria from the Goldberg Variations

These are all just off the top of my head. You can also check out this extraordinarily cheap album on Amazon filled with works deemed "relaxing" and pick and choose what you find suitable.

EDIT: formatting