Almost all movies made in India have songs in them, be it in any language. This huge market for singers, lyricists and composers makes it very diffcult for stand-alone bands to survive, especially with the lack of a strong live music scene.
"Silk Route" has just faded away now, but they made great music when they did.
Sapnay - Silk Route
Sorry about the sound quality, but this is the only video of this song on Youtube. Apparently they aren't very famous.