In 1804 in Vienna Franz Joseph Haydn arranged the ancient Welsh folksong Eryri Wen
(White Snowdon) to fit noble English words celebrating the even more noble Gelert, faithful hound to Prince Llywelyn, whose martyred corpse lay under a cairn of stones in deepest Snowdonia. But did it? Was Haydn barking up the wrong tree? And just how old was that ancient Welsh music? The hounds of history are on Haydn's tracks. Why not join them on the trail?
Compiled and presented by Sian Lloyd
Reader DILLWYN OWEN
Script by GWYN A. WILLIAMS BBC Wales
(Re-broadcast on Thursday at 7.30pm)