Drum is driven by a belt, in the back of the machine, which runs from motor to drum, If making correct motor noises, belt could have come off, or broke, top or preferably back off to fix. Sometimes top has to come off to get back off, 2 or 3 screws under back edge of top. top should then slide off to the back a short distance before lifting off. BUT they all vary, any more info needed, you will have to give more info. make model etc.
SD
September 2011