Who do you think plays on 夢幻的笑容?

What chords does 譚詠麟 - 夢幻的笑容 use?

How fast does 譚詠麟 play 夢幻的笑容?

Which chords are part of the key in which 譚詠麟 plays 夢幻的笑容?

When did 夢幻的笑容 hit the market?