I have an idea for a fun English class for continuing education people to study humorous texts taken from Monty Python and others, and also to study the rich humor of original blues music texts ("...could a matchbox hold my clothes?"!!!).

But I know I am looking at serious copyright infringement problems, even though we're not putting this stuff on stage.

Does anybody have an idea as to just how risky such a proposition is, or how I might go about gaining permission to use the texts (especially the Monty Python)?