The first song is a cover of Qin Sige Ri's music, named "Folk Songs Like Spring River".
The second song is the soundtrack of the movie Only Folk Songs Respect Your Relatives.
The third song, the duet scene in the movie, has no specific name, commonly known as "dialogue record"
Basically, you can find it on Baidu, so I won't send you the address, but I can send you an online website to listen to the movie soundtrack.
/a2/4/F/4 F2 b 6d 442 be 40 AE 9 F3 EB . html
Actually, it's not expensive to buy a DVD of Sister Liu. If you really like it, buy one and learn slowly!
It's really nice. Mr. Lei Zhenbang, a famous composer, personally went to the southwest to collect music. The songs in Five Golden Flowers and Ashima were all composed by his old man. His daughter, Lei Lei, is also a composer now. She wrote the theme song of a large-scale family comedy "Family with Children".