Bike started to sing when I'm clipped in to the pedal

[knonist]

I have recently switched to clipless (SPD), and I have noticed my bike (or my pedal) started singing.
As soon as I uncliped, the singing stoped, can anyone help?

 

[Grasen]

what song does it sing?

 

[Smokin Joe]

what song does it sing?

"These boots are made for walking".

 

[RecordAceFromNew]

what song does it sing?

We are one?

 

[amnesia]

'I like to ride my bicycle' by Queen ?

 

[zacklaws]

Mungo Jerry:- The Pushbike Song

View: http://www.youtube.com/watch?v=CCWAGpChSRI

 

[Fattman]

Pink Floyd - I've Got a Bike?

View: http://www.youtube.com/watch?v=KN-j9H0nIDs

 

[Fattman]

Seriously, though - what do you mean by 'sing'?