Blurt Out - Meaning in this sentence
In a random tweet I found:
Having lunch in a cafe in Tokyo. The current playlist blurting out on the speakers has just played:
- Hit me Baby one More Time by Britney Spears
- In Da Club by 50 Cent
- Heaven is a Place on Earth by Belinda Carlisle
- Smoke on the Water by Deep Purple.

-What’s coming next?
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what does blurt out means here? of course the sound is coming out of the speakers, but what nuance does it express?

Definition of BLURT OUT in the Oxford Learners Dictionaries:
blurt something (out) | blurt that… | blurt what, how, etc… | + speech - to say something suddenly and without thinking carefully enough.

There's no way for loudspeakers to say something without thinking carefully enough. By the way, they can't even think...

Question

Blurt Out - Meaning in this sentence
In a random tweet I found:
Having lunch in a cafe in Tokyo. The current playlist blurting out on the speakers has just played:
- Hit me Baby one More Time by Britney Spears
- In Da Club by 50 Cent
- Heaven is a Place on Earth by Belinda Carlisle
- Smoke on the Water by Deep Purple.

-What’s coming next?
--------------------------------------------------------------
what does blurt out means here? of course the sound is coming out of the speakers, but what nuance does it express?

Definition of BLURT OUT in the Oxford Learners Dictionaries:
blurt something (out) | blurt that… | blurt what, how, etc… | + speech - to say something suddenly and without thinking carefully enough.

There's no way for loudspeakers to say something without thinking carefully enough. By the way, they can't even think...

Answer

I would say that this is an incorrect use of the phrase 'blurt out'.

The dictionary definition is correct: if you blurt something out,  you say something without thinking, and then probably wish that you hadn't said it. For example, by blurting something out, you might accidentally give away a secret or say something tactless which you immediately regret.

'Blurt out' makes no sense in the context of a playlist in a cafe. The correct expression is BLARING out, not 'blurting'.

Answer

It implies the behaviour of a small child who says things suddenly without thinking.