AI music with proper commercial licensing (Solmi Pro, Suno Pro/Premier, Udio paid) is safe for monetized YouTube videos. Avoid free-tier output for monetized content unless the platform explicitly permits it.
Generally no — the audio is novel, so YouTube's Content ID won't match it against existing tracks. The risk is when AI generates something too similar to a specific copyrighted work.
Solmi for variety (every video gets a unique track on-demand), Suno for highest vocal quality if you want music with lyrics, or library tools like Epidemic Sound for guaranteed-clean licensing without AI.
Generate music AFTER editing the video. Watch the cut, note the emotional arc, then write an AI prompt that matches each section's mood.