Pranam Ram, I send a delayed response to your question raised on 9th of Aug.
I felt that generally speaking there could be three musical streams in light classical
forms which are as follows
1) Thumri, Dadra, Ghazal, Quawali
2) Chaity, Kajri, Savan, Jhula etc. (season based)
3) Bhajan, Geet, Abhang etc. (devotional forms)
As I have not studied items covering point no. 2 & 3 of the above, I have following
observations to make for point no. 1.
As we all know music comprises of three major ingredients viz. Sahitya, Swar and
Laya / Taal. If we apply each one of these ingredients to the referred to forms, we
would get the following:
| Sahitya | Swar | Laya / Taal | |
|---|---|---|---|
| Thumri | Mildly relevant | Very important | Very slow tempo (Deepchandi etc.) |
| Dadra | More relevant than in Thumri. According to some, permits some romantic themes. | Almost as important as in Thumri | Madhya Laya / Drut Laya (Dadra, Kaherva) |
| Ghazal | Very important | Much less important as melodic structure is repetitious. | |
| Quawali | Important | Much less important as melodic structure is repetitious. | Accentuated with clapping in addition to faster rhythm. |