Explanation:

- Option 1: Ghazals – Allah Jilai Bai is not primarily known for Ghazals, which are poetic songs often heard in North Indian and Pakistani music cultures.

- Option 2: Hindustani classical vocals – While she had exposure to classical forms, her fame does not mainly come from Hindustani classical singing.

- Option 3: Folk songs – Allah Jilai Bai is especially renowned for her soulful renditions of Rajasthani folk songs. She brought traditional tunes like Maand to the limelight and preserved local music heritage.

- Option 4: Bhajans – Although she may have sung devotional songs, she is best celebrated for Rajasthani folk rather than specifically bhajans.