Detectives with their own show

open playlist in Spotify application

Music score	YES
Sound effects	YES
Multiple voices	YES

There are series which go as far back as 1935. Unfortunately they also sound like that on Spotify. Maybe these detective stories need these old cracklings sounds of radio transmitters. Many characters had their own show on the radio with weekly episodes.

Detectives On the Radio

open playlist in Spotify application

Music score	YES
Sound effects	YES
Multiple voices	YES

This sounds absolutely like a vintage radio drama, but it's fun, old commercials included.
From now on I'll use the word "vintage" for not so stellar sound quality :-)