human: 生成一个包含10首与给定心情相对应的歌曲的播放列表。 输入：愉快
 bot: 1. Here Comes the Sun - The Beatles
2. Three Little Birds - Bob Marley
3. What a Wonderful World - Louis Armstrong
4. Don't Worry, Be Happy - Bobby McFerrin
5. Lovely Day - Bill Withers
6. Stand by Me - Ben E. King
7. I Will Always Love You - Whitney Houston
8. Lean on Me - Bill Withers
9. You've Got a Friend - James Taylor
10. Imagine - John Lennon