Thank you very much for your question! As for a Cantonese song you want, it starts with a long horn. Recommend a very representative song: Midnight Whispering. This song comes from the album "Midnight Whispering" by the famous singer Danny Chan. The horn sounded at the beginning of the song, which was very attractive to the ear. It should be a classic for people who like to listen to old songs.
However, it should be noted that this song comes from 1986, and the story told is also the emotion of that era. If you are not familiar with the cultural and social background of that era, you may be a little confused. But anyway, this song is worth listening to.
I hope my answer can help you. If you have any other questions, please feel free to ask!