'The Flute Song' by Remo Fernandes. This will drive you crazy and make you wanna buy a set of drums and even a bamboo flute. It's mind-numbingly awesome.
Lucky Ali: Tere Mere Saath; Sunoh; O' Sanam; Dekha Hai Aise Bhi
Musafir Soundtrack: Tez Dhaar [Billa Journey Mix] by Sanjay Dutt
Zinda Soundtrack: 'Yeh Hai Meri Kahani' by Strings and 'Zinda Hoon Main' by Shibani Kashyap
Not exactly Indian but you can't go wrong with Nusrat Fateh Ali Khan (Pakistani).
His best songs include 'Tere Bin Nahin Lagda', 'Dum Mast Kalandar', 'Sano Ek Pal Chain Na Awey (Nothing Without You)' and 'Allah Hu'
A.R. Rahman has almost never made bad music.
His best work includes:
----Album Name (Song Titles)
----Bombay Dreams (Wedding Qawali) (Andrew Lloyd Webber production)
----Dil Se Soundtrack (Chayya Chayya; Dil Se; Jiya Jale)
----Rang De Basanti Soundtrack (Rang De Basanti; Luka Chupi)
----Swades Soundtrack (Yun Hi Chala; Yeh Jo Des Hai Tera)
----Yuva Soundtrack (Khuda Hafiz; Kabhi Neem Neem)
For kick-ass dance tracks, two words: Panjabi MC [Mundian to Back Ke; Jogi]
Downloading these songs might be a major pain in the ass because everyone spells them weird.