In the 1980s, while living in Dover, I and friends often did daytrips to Boulogne, playing music in cafes in the old town. We played all sorts of music, and one of our number did a fine job of French songs, with piano box.

'Boum' and 'J'attendrai' were two of them- maybe the locals liked his 'Gravesend accent on French songs, but they used to go down well with the locals !
   Thank you Charles Trenet.....