Game Boy Advance games store their audio samples as uncompressed data in the code. By importing a GBA game file in an audio editor, these can be heard directly. Below is an excerpt of Wario Land 4 being listened to in an audio editor.

Dumb meme I made

Reminded me of this old Vinny Vinesauce Doom GBA corruption

What about warios voicelines are they stored in another way?

No, they are there among the samples, only stored at a different sample rate. Below is the relevant excerpt. Thank you very much for your inquiry!

Is there a reason the code comes out as white noise? Are there specific lines that make unique noises (Such as the ending sounding like a high pitch screechy beep)?

In general, any data imported into an audio editor that is not originally audio (text, image, etc.) will be white noise as it has quickly changing erratic values. The beep is long stretches of the same value in a row. Thank you very much for your inquiry!

Yeyeye thezazzglitch did a video about dumping a ROM using this audio

we've encountered supper mario broth's alleged rival; wario soup

I know you said it's uncompressed but that sound quality is really, really good for a GBA game.

Another fun fact: The terrible quality of GBA music is due to hardware limitations. One of the main issues being that devs had to balance cpu resources between audio mixing and gameplay and most of the time they chose to prioritize the latter