This is Deep Purple
's Mary Long, from their 1973 LP "Who Do We Think We Are?". A wonderful little ditty about Mary Whitehouse and her friends, whose primary aim in life seemed to be preventing any form of fun more exotic than bridge! She even missed the point of "Till Death Us Do Part"...
Anyway, I digress. This song is rather unususally constructed; for most of the song Roger Glover's bass rests on the root, diverging only for the chorus. Jon's organ parts sound kind of odd - almost out of time - when isolated from the guitar and vocal. But it works when put together. Ritchie plays quite a number of slide parts to make up the body of the song, but you can make it sound pretty close with a single guitar, even without the slide. Well, at least Mr Morse can!
No Vocals or guitar parts. For the end, rather than add a fade in the half time part - they even tried to do it like that in the tour for the LP - I've chosen to omit that part entirely and stop it dead at the end of the full time part. If enough of you are really upset by this, I could build the slow section and add the end as it's currently played live, but frankly, I still think it sounds messy and contrived.
Let me know what you think of it.