First, you need to prepare your songs, preferably in English.

Then go to my document and find the Rock Star game folder.

Then find the GTA V folder and open it.

Then find the user music folder and open it.

Put your music here and it's done.

Entering the game, the default scanning custom music is turned on, which can be found in the settings menu.

Since it's on by default, just listen.

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If I remember correctly, click Q (I haven't played for a short time), turn on the radio station and choose a custom radio station. I remember it seems to be next to the top one, which is the position of 1 1 or 1 ...

It is worth mentioning that you can listen to it online.