Hello AZjoycej,
Welcome to the Apple Support Communities!
I understand that you have Genius Mixes in iTunes on your Mac and when you try to sync your device to iTunes and exclude some music from those mixes, the unwanted music is still synced over to your device. To exclude the music you do not want, you may need to remove the entire mix that contains that music you no longer want. Please use the attached article as a resource and follow the steps for deselecting the mixes and stopping them from syncing.
iPhone and iPod: Understanding Genius Mixes - Apple Support
To sync selected Genius playlists and Genius Mixes to your device:
- In iTunes, select your device in the device list and click the Music tab (or button, depending on the version of iTunes being used).
- Check Sync Music, and then choose "Selected playlists, artists, and genres."
- Under Playlists, select the Genius playlists and Genius Mixes you want.
- Click Apply.
Notes:
- Genius Mixes can only be synced automatically, so you won't be able to add Genius Mixes to your device if "Sync only checked songs and videos" is checked in the iTunes Summary pane.
- If you select any Genius Mixes to sync with your device, iTunes may select and sync additional songs from your library that you didn’t select.
- If you choose to sync your entire music library, iTunes will sync all your Genius playlists and Genius Mixes to the device.
Best regards,
Joe