If you have problems playing music on Mac
In the Music app on your Mac, do any of the following if you have trouble playing music or other audio:
If the progress bar at the top of the Music window is moving, but you don’t hear anything
If you’re using your computer’s built-in speakers: Make sure the volume controls are not turned down. Check the control at the top of the Music window and check the computer’s output volume (in the Sound Output settings). See If you can’t hear sound from your Mac speakers.
If you’re using powered speakers connected to your computer: Make sure the powered speakers are properly plugged into your computer’s audio port, plugged into a power source, and turned on. Also make sure their volume isn’t turned down.
If you’re trying to listen to music through remote speakers using AirPort Express: Make sure the remote speakers are selected in the AirPlay pop-up menu at the top of the Music window, and the volume control on the speakers isn’t turned down.
If you can’t play a song
If you can’t play a song purchased from the iTunes Store: You may have exceeded the number of computers on which you can play your purchases.
If the song isn’t an iTunes Plus version, you can play it on up to five authorized computers. After you authorize five computers, you can’t play the songs on a sixth computer until you deauthorize one of the five authorized computers. (For instructions on deauthorizing a computer, see Authorize a Mac to play iTunes Store purchases.)
If you’re listening to a shared library or playlist: Music skips iTunes Store purchases if your computer hasn’t been authorized to play them. To listen to a purchased song in a shared library or playlist, double-click the song. If your computer isn’t authorized to play songs purchased by the person who is sharing the song, to hear it you’ll need to enter that person’s Apple ID and password. See Share songs from a shared library in Music.
If you’re trying to play an AAC file that was not created using Music or downloaded from the iTunes Store: Songs you download from the iTunes Store or import into your library using the AAC encoder are encoded using the MPEG-4 AAC format. Songs in this format play in Music and on your iPhone, iPad, and iPod. Other AAC files that you find on the internet or elsewhere won’t play in Music. See Choose import settings.
If you’re trying to play a song on a CD that you burned using Music: You can’t play DVDs burned using Music on most consumer DVD players. So make sure the playback equipment you’re using is appropriate for the disc’s format. For example, if you burned a CD-RW disc, you can play it only on your computer and some newer CD players. If you burned an MP3 disc, it should work in your computer and on special MP3 CD players but not on standard consumer audio CD players. See Intro to burning CDs and DVDs.
If you’re listening to a playlist that includes a song preview: The playlist stops after the song preview. Double-click the next song in the playlist to resume playing the rest of the playlist. A song preview in your library or a playlist has a button next to it showing the price.
If songs are missing or dimmed, see the Apple Support article If songs are missing from your music library after you turn on Sync Library.