Aerosmith has just kicked off the European leg of their world tour with Slash, and since the band always has a little down time during the day so frontman Steven Tyler has spent his days wandering around the city's that they are playing and randomly sitting in and jamming with street musicians!

We showed you the video last week of him singing (and forgetting the words!) to the Aerosmith hit Cryin' with a violinist and accordion player in Lithuania, but as the tour continues across Europe, more videos are starting to pop up like taking over for a bottle performer in Helsinki to do a version of "Dream On."

He then moved on to add percussion to a fiddle player's performance.

If you could jam with any living musician, who would it be?