All you need to make a beat is bang two sticks together. A child could do it (confidential to percussionists: we're not really serious. Please don't sue for libel). YouTube performers Wax and Herbal T took this idea to its logical conclusion and made a rap song using sounds from Herbal T's toddler son's playground session.
An alcoholic father routinely dumped angry messages in his son's voicemail, until his son took his words and set them over some beats and piano lines. The resulting track is incredibly dark, but a fascinating way of dealing with your problems.
Song is loaded with language that might be too strong and imagery that might be too graphic for some.