Although Rafi saab is my most favorite singer for songs of every mood, when it comes to "Udaas" mood, I only feel like singing Talat Mehmood songs. There so many that come to my mind -- Talat was absolutely the champion of the "blue mood" songs --
1. Meri yaad mein tum na ansoo bahana
na ji ko jalana, mujhe bhool jana....
2. Jaye to jaye kahan, samajhega kaun yahan
Dard bhari dil ki juban...
3. Tasveer banata hu, tansvir nahi banati,
tasvir nahi banati...
4. Andhe jahan ke andhe raste, jaye to jaye kahan...
5. Ansoo samaj ke kyun mujhe ankhse tumne gira diya....
6. Ai mere dil kahin aur chal,
gum ki duniya mein dil bhat gaya....
7. Humse aya na gaya, tumse bhulya na gaya....
8. Sub kuch loota ke hosh mein aye to kya hua
din mein agar chirah jalaye to kya hua....
9. Sham-e-ghum ki kasam, aaj gum hai
aa bhi ja aabhi ja aaj mere sanam
10. Teri ankh ke ansoo pijaoo
aisi meri takdeer kahan...
11. Phir wahi sham wahi ghum wahi tanhayee mein
dil ko samajhane teri yaad chali ayi hai
12. Yeh hawa ye raat ye chandani
teri ek ada pe nihar hai
13. Jalate hai jiske liye..
14. Main teri nazar ka surror hun
tujhe yaad ho ke na yaad ho....
You are absolutely right when it comes to sad songs, Talat Mehmood is the king. I love all jis songs.