I’ve been reading John Barton’s book Playing Shakespeare, which pretty much transcribes a series of televised master classes. It’s a pretty amazing book, in which Barton claims that Shakespeare’s lines provide clues to how they should be read — the irregular stresses in the verse, the changes from prose to verse and back again.
I googled around trying to find the original series, but found these instead. Here are two ten-minute segments. Spanning the two is David Suchet reading Sonnet 138 several times, receiving direction. (I think I personally prefer his second reading.)