In 1970 he was asked to represent Luxembourg at the Eurovision Song Contest with 'Je suis tombé du ciel'. The song wasn't exactly successful: it received no points at all and ended up in the last of 12 places. Listening to both sides of this single, I would have to say that the word 'subtle' isn't exactly in David Alexandre's dictionary. Both songs are quite loud, and mostly because of the vocals.
My collection: 7" single no. 6563
Found: Discogs.com, received 7 December 2021
Cost: €4
Tracks: 'Je suis tombé du ciel' / 'Isabelle mon amour'