YouTube on Thursday unveiled some new experimental AI services, including a feature called Dream Track in YouTube Shorts. It creates up to 30-second soundtracks using AI-generation versions of artists' voices. Though musicians have mostly pushed back on AI (and their voices being used for training models without permission or compensation), YouTube got nine big names from the music industry to participate, including John Legend, Troye Sivan, CharliXCX and T-Pain. The company hoped to announce the feature at its Made on YouTube event in September, but it's been tied up in negotiations with recording companies over rights and payments. Users can access Dream Track by typing an idea into the creation prompt and choosing from one of the participating artists.