curl --request POST \ --url 'https://api.uberduck.ai/tts/freestyle' \ --header 'Content-Type: application/json' \ --header 'Accept: application/json' \ --header "Authorization: Basic $UBERDUCK_TOKEN" \ --data '{ "bpm": 90, "backing_track": "5fff1ec6-8736-4992-a842-8b78d37b8a8a", "lyrics": [ [ "Hello world, Im the rap king, the one and only", "My rhymes so complex, theyll leave you feeling lonely", "Im like a surgeon with a scalpel, precise and deadly", "My metaphors and similes, they hit hard and steady" ] ], "voicemodel_uuid": "c8a916b4-4574-4042-82a1-3cead35331c9" }'