song make me wonder??

Yesterday, when i chatting with my friend..he promote me a song..is a french song without lyrics..the singer are jean baptise and clemence..the music is concerto pour deux voix..earlier it is just music..and then at their voice is inserted..hehe..nice music u noe..i keep waiting for the lyrics..but it juz voice only..juz listen to it..then u will noe wat i mean..check on you tube ..http://www.youtube.com/watch?v=ByK06_Kmgzc