Next wednesday i'll be teaching passive voice, could you give a sugestion about a song that could be useful for this??

Can't think of one. I use 'I packed my suitcase' or 'I had a pet cat' for all that sort of thing. The students take turns reciting and adding phrases in alphabetical order to a long sentence:

(nouns) 'I packed my suitcase, and I took my Apron...and I took my Baseball cap...and I took my Crossword puzzle book...etc.'

(passive voice) 'I had a pet cat and it was Approved by the vet.... and it was Bought in Chicago... and it was Covered with grey fur...etc.'
Thank you Mister Micawber, it will be really helpful thanks!