If you want to try a tool to help you come up with melodies and chord progressions, Hooktheory is a good place to start. It's got a variety of tools, including Hookpad for composing music and beats, Music Theory Books for interactive lessons, and Chord Crush for identifying chords by ear. Hooktheory's technology is trained on a large library of popular songs, so it's good for musicians of all levels.
Another good option is MelodyStudio, which uses AI to come up with ideas for original melodies based on your lyrics. You can add chords and backing tracks, and it'll suggest melody lines you can modify to your taste. That makes it useful for songwriters, producers and singers trying to break through a creative logjam or improve their skills.
If you're struggling to come up with ideas and need a little help with writer's block, Staccato is an AI-powered site that turns words and lyrics into music loops, samples and drum tracks. It also has an AI Lyrics Generator and can link to popular DAWs and notation software, so it's a good all-purpose tool to help you improve your songwriting and production skills.
Last, Cadenza is an AI music production tool that's geared specifically to coming up with chord progressions that sound professional. It can handle a variety of chord types, and you can import MIDI files into DAWs. That makes it a good option for beginners who want a little inspiration or a particular sound without having to know a lot of music theory.