No indians in London! Trust me on this one! I think you may have heard a wild medieval party,after all,drums were all the rage back then,and they did some really hard parting-beleive it or not -even back then .They had many cerimonies involving drums.Armies marched off to war with drums beating. People were hung ,by the drum beat!Heads were taken clean off with the roll of drums! Was this after a storm,or was it raining? Did anyone else hear this thing? Might want to ask around.(read my story"Fight without a trace",under ghost stories Bill goodman)You might have to "pry " it out of them with a pitch-fork,as people don't like to admit to what is not exactly "sain" conversation.Older people might be more willing-- then the young. Children --will tell you -always- if they heard anything.Check your date with historic dates . Local Historical societies are really great for this.You might get the shock of your life.We'd like to get the shock of our lives too,so if you find out anything it would be great to hear about it.I know that people got dressed up for different things like,"The right of spring". "String theory" -which many scientist are beginning to believe- proclaims that there may be many realities dwelling on same land mass,all at one time,or many "times".An't it great! And here they thought they had it all figured out! April fools on science!