See the DT file.  BEDLAM BOYS

There is also useful information on this and related songs in these previous discussions:

Tom O'Bedlam's Song
Tom of Bedlam

Many people appear to have learnt the abridged text recorded by Steeleye Span back in 1971; this was set, not to the old tune (which is given in the DT, but to (so far as I know) a new one by Nic Jones and Dave Moran.