Barry Pheloung's background music gets worse each time.
Constant repetitive "noodling" of not much more than four long notes.
Yes. It was part of the old format that began with Morse: long, drawn-out episodes with not much action and long, rambling pieces of incidental music to set the tone. Thinking about it, whenever there was any real excitement in Morse, they would play Wagner or Mozart instead and the pace would pick up considerably. Moving Lewis to one-hour episodes would have been the ideal time to drop the Pheloung music and bring in something a bit jauntier.