Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| No. | Song | Singers | Length (m:ss) |
| --- | --- | --- | --- |
| 1 | Kalluri Padam | Shankar Mahadevan | 01:32 |
| 2 | Iru Kangal | Balram, Gopika Poornima | 04:49 |
| 3 | Sithanna Vasal | S. P. Balasubramaniam, Sujatha | 04:53 |
| 4 | Thozha Thozha | Karthik | 03:57 |
| 5 | Vidinjakka Kannalam | Chitra Sivaraman | 04:20 |
| 6 | Mullai Poo | SPB Charan, Venkat Prabhu, Yugendran | 04:33 |
| 7 | Yarum Ariya | Pavithra | 05:16 |
| 8 | Salsa - Theme Music | Instrumental | 01:33 |
Question:
what is the number of songs sung by two singers?
Answer:
3