We used to call Martin Carthy "The Source". Some of the songs I've enjoyed playing that I learned from his albums:

May Song
Seige of Delhi
Sovay
The Two Magicians
The Maid and the Palmer
Brigg Fair
The Wife of the Soldier
Oor Hamlet
Geordie
The False Knight on the Road
Cold Haily Windy Night
The Bedmaking
Willie's Lady
The Wren
Billy Boy
The Bonny Lass of Anglesey