Transmission1

Has anyone else picked this up?

its like someone has a terrible mp3 to rf transmitter in their car or something playing pants R&B music.
doesn't stay for long though fades out like they are moving away.

Look very local to you. 156.0 is probably one of the worst frequencies for low power interference from power supplies. The cheap unfiltered switch mode psus are a killer! My internet router was replaced my talktalk and shut down channel 0 in my office, until i found it and put the old power supply back. My journey to the office in my van is a noisy one. Three houses i pass in walking speed traffic have enormous amounts of noise, and one does have music quietly in the background. Probably plugged into a powered speaker. Knock on doors within 25m if the neighbours are friendly. If the interference has only just started, i bet one has had a recent delivery.

it's been going on for a month now, thankfully it's brief and only every few days or so.

if you have a portable have a wander, one way it vanishes, other way it gets stronger. should be fairly easy to find.