Many people didn’t even stop to listen when four-time Grammy Award-winner Seal joined a Montreal busker for a duet of the song "Stand By Me" this week in Old Montreal's Place d'Armes.

A few lucky passersby did, however, notice that something special was going on.

Video of Seal's seemingly impromptu duet with J Deeh, from local band The Scroll, was posted to YouTube and Twitter.



Others took cellphone video and posted it to Twitter too, where Seal was among the many who hit "retweet."



It was not clear why Seal was in Montreal but he posted an image to his Instagram page bidding the city farewell.



Auvoir Montreal.

A photo posted by SEAL (@seal) on