I have collected a lot, so donate some.

Introducing the sad ones first:

1. Gray Space (humming version)

2. Castle in the Sky (chanting version)

3. Stairway to Heaven (humming version)

4. Theme Scat (humming version)

5. Platycodon’s sad life (humming version)

6. Sad Aria Sad Love Song (humming version)

7. Memory (humming version)

The first three songs are played in many true love stories, and the tune is very sensational.

Better than sadness:

1. The flight I want (humming version)

2. Beautiful mood (humming version)

3. Gratitude to Parents (humming version)

3. My Girl (humming interlude)

4. FLOW Ma Xiyu (humming version)

5. I caught a cold in that corner (humming version). This song was the music in an advertisement for a certain mobile phone before. It’s not bad.

Cheerful ones:

1. Little Fresh (humming version)

2. Full House (humming interlude)