Consider the following statements about Hindustani music compositions.
1. Dhrupad is a serious and sober composition which demands effort from the vocal cords and lungs.
2. `Khayar is a word derived from Persian and implies 'idea' or 'imagination'.
3. The Thumari is a light form based on the romantic religious literature inspired by the Bhakti Movement.
4. The Ghazal is yet another product of the Indonesian influence on Hindustani music.
Which of the statements given above are true?