My list:
1. Ella Fitzgerald and Louis Armstrong, Cheek to Cheek (Cole Porter)
2. Hemant Kumar, Na Tum Hamen Jano (from Baat Ek Raat Ki)
3. John Coltrane and Johnny Hartman, My One and Only Love
4. The entire early ouevre of the sublime Al Green
5. Velvet Underground & Nico, I'll Be Your Mirror
6. Amadou & Mariam, Mon Amour, Ma Cherie
7. Everything But the Girl, Before Today (Walking Wounded)
8. Bob Dylan, Tangled Up in Blue
9. Magnetic Fields, The Luckiest Guy on the Lower East Side (69 Love Songs)
S.'s list:
1. Lata Mangeshkar, Kabhie Kabhie (from Silsila)
2. Diana Krall, Peel Me a Grape
3. Kumar Sanu and Kavita Krishnamurthy, Rim Jhim Rim Jhim (from 1942: A Love Story)
4. Mohammed Rafi and Lata Mangeshkar, Tere Bindiya (from Abhimaan)
5. Aamir Khan and Alka Yagnik, Aati Kya Khandala (from Ghulam)
6. Sonu Nigam, Saathiya (from Saathiya)
7. Lata Mangeshkar, Pyaar Kiya to Darna Kya (from Mughal-e-Azam)
8. Lata Mangeshkar, Abke sajan saavan mein (from Chupke Chupke)
9. Do You Love Me (from Fiddler on the Roof)
Feel free to share your obscure (or familiar) favorites below...