For some reason this plot developed around this image in my head.
The Master walking along a country road, after a failed attempt to get directions from a cow to UNIT HQ, hears off in the distance a very deep base noise
The Master pauses in his walk to try and work out what the noise he hears is "You know if I were in an earth period later then the nineteen seventies I could swear that's rap music I hear, wait what's-" he then finds himself having to duck for cover quickly as a yellow Edwardian roadster playing some form of rap, rips its way around a corner, nearly running him over, picking himself up after this brush with death he looks back at what nearly ended his current life flying off into the distance, rage filling his face "Whoever that was they shall not see the en- wait, I recognise that car, is that, it is! Good grief his exile must be getting to him if he's willing to risk introducing that racket a decade early. Oh Doctor you poor fellow, I'm almost feel sorry for you" he then finds this amusement enough to continue on his journey with renewed enthusiasm.
Meanwhile in Bessie Liz shouting over the stereo system "Doctor, what was that we went passed" The Doctor "What was what my dear"? he says, turning down the system a bit "I could have sworn we nearly hit something" "well if we did, at this speed Miss Shaw we'd have definitely known about it, so, what do you think of the music of a few decades from now" "a bit odd, the base rhythms nice though, I like these drinks by the way, what are they made from"? "your probably better off not knowing" he says, as he turns the system back to its previous volume, continuing on one of the brigadiers errands.