Consider the following statements about folk music traditions in Punjab:

1. The Shabad Kirtan tradition uses classical ragas to perform hymns from Guru Granth Sahib.
2. Dhadis are musicians who sing martial ballads about Sikh warriors and historical events.
3. The Patiala Gharana of classical music was founded by Guru Nanak during his travels.
4. Punjabi folk instruments include toombi, algoza, chimta, and sarangi.

Which of the above statements are correct?