If you're looking for a different Magenta, CassetteAI is a good alternative. This AI music generation tool lets you create tracks with no music or technical skills. It uses machine learning algorithms to create music based on parameters you can set like genre, mood, length and instrumentation. CassetteAI focuses on user control and privacy, so it's good for beginners and pros.
Another alternative is AIVA, an AI music generation tool that can create new songs in more than 250 styles. AIVA has a lot of control options, including the ability to upload audio or MIDI influences and edit generated tracks. With different pricing levels, it's good for solo creators and pros, and it offers flexibility and high-quality results.