AI generated music is not protected by copyright, at least in the US, since copyright can only affix to works created by humans (the "human authorship requirement").[1][2] Without copyright protection, there is no "economic value" -- at least directly tied to the songs themselves. AI generated songs are not paid royalties at e.g. The Mechanical Licensing Collective for US streaming use.[3]
[1] https://www.govinfo.gov/content/pkg/FR-2023-03-16/pdf/2023-0... (Copyright Registration Guidance section)
[2] https://ipwatchdog.com/2022/02/23/thaler-loses-ai-authorship...
[3] https://www.copyright.gov/ai/USCO-Guidance-Letter-to-The-MLC...