The music radio’s design's are based different iterations of the Crosley Cathedral radio.
Functions
Interacting with the radio will play an instrumental soundtrack.
In Bendy and the Ink Machine, an instrumental and shortened version of a fan song is played, except in the fifth chapter where it plays an official song. The radio can't be played again after the song has finished. It can only be found once per chapter.
In Chapter 3: Rise and Fall, the music radio sits on a box next to some instruments near Level 11. It's located in a small corner of the stairwell which connects the levels of the workshop. The radio plays an instrumental version of Bendy and the Ink Musical by Random Encounters.
The music radio in Chapter 4.
In Chapter 4: Colossal Wonders, the radio can be made by using the Ink Maker. To do so, Henry must place thick ink into the Ink Maker in the cavern, turn the dial to "Radio", and crank the machine. The music radio plays an instrumental version of Can't Be Erased by JT Music.
The music radio in Chapter 5.
In Chapter 5: The Last Reel, in order to obtain the radio, Henry must first drain the Film Vault area to get access to it. He will stumble upon some boxes. The first box to his left can be open, thus revealing a radio. The music radio plays a poor quality version of Lonely Angel / I'll Be Your Angel performed by Lauren Synger.
The radio is one of the randomly generated supplies that Buddy Boris needs to collect before he heads to the next level(s).
Trivia
Prior to the release of Chapter 4, the music radio does not glow when the player interacts with it.
Chapter 5's music radio is so far the only music radio that contains an official song instead of a fan-made song. It is also the only song to contain lyrics.
In Joey Drew' s apartment, a more realistic version of the radio is found on the desk with the model of the lighthouse. This radio doesn't need to be interacted with and plays I'll Be Your Angel in a loop.
Gallery
The official screenshot of the music radio in Sammy's office.
