Episode 4 songs in order of appearance: 

Michelle Osis -  Collusion
Jonathan B. Buchanan - Never give up
Joni Fuller - Cipher
Bastien Deshayes & Nicolas Clergue - Ride home
The Fontanas - Pot of gold
Rafael Osmo - Feelings
Sarah deCourcy - Wrong side of the tracks
Paul Reeves - Bletchley park
Richard Harvey - Water towns
Jan Cyrka - Stash the cash
Peter Beckmann -  Special agent
Robert John Foster - China tea
Bastien Deshayes & Nicolas Clergue - Turbo
Paul Reeves - Sad reflections
Stavros Gasparatos - Inception
Sarah Eisenfisz - Haunting Your Dreams (Black Hydra Remix)

The beautiful Chinese song that plays in ep 1 and in ep 2 at 11:02 is: Mountain Snows -Richard Harvey

 https://www.youtube.com/watch?v=5lKkDUbFFN4

Hi, I was just wondering if someone could tell me what music plays at 4:40 in second episode of this show? Please help me. The same music plays in many more episodes of this show.

 CosmicL777:

The beautiful Chinese song that plays in ep 1 and in ep 2 at 11:02 is: Mountain Snows -Richard Harvey

 https://www.youtube.com/watch?v=5lKkDUbFFN4

I know this is very old but I realized I never commented. Thank you so much for sharing the name. That song makes me feel so many emotions and I just can't help but cry. I forgot the name of the song again and came back here to remember what it was called :')