电视剧承诺主题曲
答案：《承诺》电视剧主题曲是由许嵩演唱的《有何不可》。
经典电视连续剧主题曲
答案：以下是一些经典电视连续剧主题曲：
1. Friends - I'll Be There for You by The Rembrandts
2. Game of Thrones - Main Title by Ramin Djawadi
3. The Sopranos - Woke Up This Morning by Alabama 3
4. The Office (US) - The Office Theme by Jay Ferguson
5. Breaking Bad - Main Title by DA V e Porter
6. The Fresh Prince of Bel-Air - The Fresh Prince of Bel-Air Theme by DJ Jazzy Jeff & The Fresh Prince
7. The X-Files - The X-Files Theme by Mark Snow
8. Seinfeld - Seinfeld Theme by Jonathan Wolff
9. Cheers - Where Everybody Knows Your Name by Gary Portnoy
10. The Walking Dead - Main Title by Bear McCreary.