...ah ah ah ... in fact , she was placing her left hand on the neck itself , and didn't remove it when i started to play...so i made a very nice mistake starting that song and wasn't really happy about it...and was worrying for the rest of the song...i shouted in her ears : please remove your hand from the neck , i need to play , thanks ! ...first time this happens...the last one i hope ! :-)))))))
Alain