Welcome to the Apple Support Communities. I understand from your post that you would like to know how to import songs to GarageBand from your iTunes library. I am happy to help you with this.
The following article details how to use the Media Browser to search for, play, and import the songs found in your iTunes Library into GarageBand. Make sure you're clicking on the 'iTunes' category or 'Music' sub-category to see the songs listed in the bottom pane:
GarageBand for Mac: Use the Media Browser
Let us know if you have further questions.
Have a fantastic day!
Import a song from the Music app into GarageBand for iPad. You can import songs from the Music app on your iPad into Tracks view. You can import a song to an existing Audio Recorder or Amp track, or have GarageBand create a new Audio Recorder track for the song. The following article details how to use the Media Browser to search for, play, and import the songs found in your iTunes Library into GarageBand. Make sure you're clicking on the 'iTunes' category or 'Music' sub-category to see the songs listed in the bottom pane: GarageBand for Mac: Use the Media Browser Let us know if you have further questions.
Garageband Music App
Dec 4, 2017 2:00 PM
GarageBand User Guide for iPad
Import Music Into Garageband Ipad Pro
You can import songs from the Music app on your iPad into Tracks view. You can import a song to an existing Audio Recorder or Amp track, or have GarageBand create a new Audio Recorder track for the song.
Songs imported from the Music app do not follow tempo changes you make in GarageBand.
Import a song from the Music app
To import the entire song, set the current song section to Automatic; otherwise, only the portion of the song that fits the current song section is imported.
To get a list of tracks, tap the Tracks View button .
Tap the Loop Browser button in the control bar, then tap Music.
You can search for songs by name, or browse by album, artist, genre, or playlist.
To preview a song, tap it in the list. You can control the preview volume with the slider at the bottom of the list.
Drag a song from the list to Tracks view. Align the left edge of the song with the bar or beat on the ruler where you want it to start playing.
Import Music Into Garageband Ipad 2
After importing the song, you can make the song section longer, then resize the imported region so that more of the song plays.