In Amar Prem he used the raga for two more songs Bada Natkhat Hai Re and then again in Kuchh Toh Log Kahenge. Let me hasten to add that in Kuchh Toh Log, the notes of Khamaj merge into Raga Kalavati. But even then can you think of another movie which has three songs based on the same raga in one movie?