No, it's not normal. The output is almost always song lyrics annotated with markup like [Bridge], [Chorus] etc. I think they're using something from OpenAI with a system prompt and/or domain-specific training on top.
It's not a pure AI output - I generated a bunch of lyrics in text (which doesn't use credits), selected the best one (obviously), padded them out with some repetition, entered a style, generated the audio a few times, selected my favourite audio, and edited the audio (poorly) by repeating a few bars of the intro to make it longer. You don't see the times it generated lyrics about X.509 certificates (even though the prompt was for them to be a valid X.509 certificate) or the times the vocals were unintelligible.
Here's another good version of the song with a different style: https://suno.com/song/2775f188-7582-4970-ac71-5a3b82e39a04?s...
Here's are two versions that are disqualified because you can't make out the lyrics: https://suno.com/song/9cebb5b3-c336-495e-be3d-195ea338eb52?s... https://suno.com/song/c6f0e666-ce91-4494-a8b5-1232862965c1?s...
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I think generative AI does work as a toy. You can ask for all sorts of insane nonsense and laugh at what the program spits out to fulfil your request. I was a paying customer of AI Dungeon 2 (before the incident where OpenAI and/or the Mormons broke it in a poor attempt to impose safety rules).
I didn't keep any lyrics failures, but at the time, I was playing around with requesting songs that were also valid computer files, so here's one that went well: a "religious folk song that is also a valid Cisco configuration file", with the style changed to trance after the lyrics were generated: https://suno.com/song/32aa6d33-0f9f-4d3b-ad53-46a5fe238916?s... and another: https://suno.com/song/32aa6d33-0f9f-4d3b-ad53-46a5fe238916?s...
Juniper doesn't work as well because of the punctuation - it can generate lyrics with braced blocks, but they don't sound like anything: https://suno.com/song/32a0d70c-c9c9-468e-8905-67669c6b90d4?s...
Here's "a religious folk song that is also a valid COBOL program, without any English words": https://suno.com/song/b75aae68-9c1e-46e5-94d4-8bc63387640e?s...
Here are some that aren't configuration files but just sound cool. Prompt was something like "Write a song about a technological dystopia where everyone can only speak BGP." https://suno.com/song/1866516b-e133-47a5-a0ac-23ccb36f81ab?s... . This one's probably a song about "network protocols and their pros and cons": https://suno.com/song/23584394-7058-4bc1-8187-b3d286d36ec4?s...
And while I'm looking at my Suno outputs list, the reason I ever bothered to use it was to see if it could render these lyrics as a ripoff of "Pure Imagination" from Willy Wonka (it cannot because it only makes actual music): https://suno.com/song/19d1a90d-9ed6-4087-94e5-89e41363726e?s...
(I'm assuming that you can open these pages just by having the links. Some of them are set to public visibility.)