I am teaching English as a foreign language to adults with a very basic level of English and would like to give them some folk/traditional songs. The songs should be easy to remember, and consist mainly of vocabulary/expressions that will be useful for them in everyday life ie not too much archaic/specialist vocabulary/poetic reversal. Repetitive or cumulative songs are great - they have enjoyed "The Rattlin' Bog" for example, but "The Prickle-eye Bush" would be too difficult.
I'd be very grateful for any song suggestions.