I am not good at English. So I am using a translator. Even if you don't get the message, just do it.

There's no Vault-Tec Workshop?
No problem. Just use it.

This mode is based on the two modes below.
 
Alternative Fallout Music – Vaults - https://www.nexusmods.com/fallout4/mods/12755
Relaxed Settlement Music (RSM) - https://www.nexusmods.com/fallout4/mods/23720

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V 1.1
   
This mode may place different BGMs in each settlement. In addition, BGM can be arranged according to day and night in each settlement.

If you want to hear BGM for Abernathy Farm,

Data\Music\settlement Track\Abernathy Farm Track\Day
Data\Music\settlement Track\Abernathy Farm Track\Night

Each BGM can be placed according to the path above, and five audio files can be placed inside each folder during the day and night.
If you don't want to set BGM in every settlement, you can just set it to the same BGM for every settlement at once.

Data\Music\settlement track\[Settlement public track]\Day
Data\Music\settlement track\[Settlement public track]\Night

If you insert the audio file into the path above, all the settlements play back to the same BGM.

Data\Music\ Vault Track\ Vault 75 Track
As above, there are some cases where there are no folders for day and night. This is not a settlement or a village where people live. So did not distinguish between day and night. Just insert the audio file  the folder.

Finally, the file can be named from Track01.xwm to Track05.xwm


This mode should basically be executed regardless of the order of the modes, but I recommend you to keep this mode at the bottom.
There are times when the BGM is not played due to the stupid gaming system of the fullout4.
In this case, the radio of Pip-boy is turned on and off! then it is normally executed.
   
The list of villages or areas where BGM is set is as follows.
 
Abernathy Farm
Boston Airport
Bunker Hill
Castle
Coastal Cottage
County Crossing
Covenant
Croup Manor
Egret Tours Marina
Finch Farm
Graygarden
Greentop Nursery
Hangman's Alley
Home Plate
Jamaica Plain
Kingsport Lighthouse
Murkwater Construction Site
Nordhagen Beach
Oberland Station
Outpost Zimonja
Red Rocket Truck Stop
Sanctuary Hills
Somerville Place
Spectacle Island
Starlight Drive-In
Sunshine Tidings Co-op
Taffington Boathouse
Tenpines Bluff
The Slog
Warwick Homestead
 
Prydwen Command Deck
Prydwen Main Deck
Prydwen Quarters
Railroad HQ
 
Vault 75
Vault 81
Vault 81-Secret
Vault 88
Vault 95
Vault 111
Vault 114
Vault 114 Park Street Station Track