既然你说没有歌词，那就也不是《到未来日子》也不是《当年情》
这曲子收录在英雄本色的原声大碟里，名字就叫：《1. A Better Tomorrow Theme (03:36)Music from "A Better Tomorrow"》
顾嘉辉作曲，纯音乐，很经典
附上《英雄本色》原声大碟目录
1. A Better Tomorrow Theme (03:36)Music from "A Better Tomorrow"
2. Fatherly Advice - The Trip To Taiwan (02:26)
3. Doing Time - 3 Years Later (01:14)
4. A New Leaf - Mark And Sung's Reunion (02:45)
5. Conspiracy (01:22)
6. Sung Chi-Ho's Theme (01:12)
7. Hong Kong At Night (01:05)
8. Mark's Theme (01:37)
9. A Better Tomorrow Theme Song - Instrumental (04:23)
10. A Better Tomorrow II Theme Song - Instrumental (04:30) Music from "A Better Tomorrow II"
11. Mark's Death - A Better Tomorrow II Opening Scene (01:50)
12. A Better Tomorrow II Theme (Reprise) (01:25)
13. A Better Tomorrow II Theme (Reprise) (01:17)
14. Ken Takes Lung Si Away From the Mental Institution (01:31)
15. Lung Si in New York (01:13)
16. At Becky's Grave (02:17)
17. Operation Commenced (02:59)
18. Lung Si Regains His Memory (01:08)
19. Assault on Kao's Mansion (01:38)
20. Aftermath - (restaurant re-opens) A Better Tomorrow II End Credits (02:26)
21. A Better Tomorrow Theme (Reprise) (03:39) Miscellaneous Music from "A Better Tomorrow" and "A Better Tomorrow II"
22. Longer Version of Score Used In Scene Where Sung Becomes A Cabby (04:14)
23. Investigation (04:22)
24. "Tomorrow Will Be Better" - Instrumental Version of Children's Choir Song (05:24)
25. A Better Tomorrow Theme Song - Instrumental (Reprise) (04:23)
26. A Better Tomorrow II Theme Song - Instrumental (Reprise) (04:30)
27. A Better Tomorrow & A Better Tomorrow II Theme Combo (03:31)
28. Mark's Theme (Reprise) (03:49)
29. a better tomorrow 当年情 [Leslie Cheung 张国荣]
下面的链接是这首音乐，好像和电影里的编曲略有不同
http://www.songtaste.com/song/714847/# 耐心听，到1分20秒左右就是他们跳墙进去然后分兵器然后大开杀戒了
第一部小马哥开传回来掉头等等很多经典地方都是这个主旋律