Macabre Mansion

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Music score	NO
Sound effects	YES
Multiple voices	YES

A group of enthusiast storytellers perform dark tales with a bizarre or supernatural twist that are sure to captivate your attention and leave you wanting more. Check their website http://www.macabremansion.com.

Not From Space

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Music score	YES
Sound effects	YES
Multiple voices	YES

As heard on XM Satellite Radio, this scathing satire of the advertising industry taunts you with a live radio broadcast complete with all-too-truthful commercials from a series of wacky sponsors you'll grow to love. The station's owner is Jimbo Thomas -- always ready to weasel his way onto the airwaves just because he likes the sound of his own voice. Listen to breaking news as an assassination attempt unfolds and the sponsors seize the opportunity to cash in on the latest frenzy. Soon alien visitors arrive from a neighboring world, sending Earth's two biggest corporate empires into the ultimate power struggle -- fighting for control of the very station you're listening to.

The Cleansed

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Music score	YES
Sound effects	YES
Multiple voices	YES

The Cleansed is a free post-oil apocalyptic drama podcast set fifteen years after the depletion of the world's oil reserves and the massive unrest that followed. It follows the story of John Prophet, an ex-soldier who has never given up the fight, as he tries to rally a force to fight the totalitarian "New Republic" whose oppressive forces shadow old New York. John's journey takes him to rural Maine, where two youths who have grown up in an off-grid Refuge are the only ones willing to heed his desperate warnings. With trouble on their heels, the three set off on an uncertain path fraught with grim survivalists, rugged individuals, religious maniacs and dangers of nature that have grown up in this strange land.

Detectives with their own show

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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.

Blake's 7

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Music score	YES
Sound effects	YES
Multiple voices	YES

A radio play reboot of the '70 TV-series every Sci-Fi fan will appreciate. This is the HBO of audio series, supreme quality!  3 episodes of Blake's 7 The New Series and 8 prequel episodes. Each prequel episode describes the back stories for one or more of the main characters.

Detectives On the Radio

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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 :-)