Open the iTunes app and go to the Store or Library tab.
By default, iTunes downloads music in with an .m4a extension. You can ensure you're getting the best quality (typically 256 kbps ) by checking your preferences. On PC: Go to Edit > Preferences > Downloads . On Mac: Go to Music > Settings > Playback . itunes-m4a-download-blog
Look for the Cloud icon next to songs or albums; this indicates the item is in your account but not yet on your device. Open the iTunes app and go to the Store or Library tab
Go to Edit > Preferences > General > Import Settings . Choose Encoder: Set "Import Using" to AAC Encoder . On PC: Go to Edit > Preferences > Downloads
Select a song in your library, then go to File > Convert > Create AAC Version . Quick Tips for M4A Files