Good afternoon mxnews,
Welcome to the Apple Support Communities!
Congratulations on the purchase of your Apple TV 4K! It sounds like you have entered your Apple ID and iCloud information to access services. To access all of the music on your MacBook Pro, you will need to set up Home Sharing. Take a look at the information from the Apple TV 4K User Guide:
Apple TV User Guide - Stream content using Home Sharing
You can stream music, movies, TV shows, photos, and other iTunes content from a computer or iOS device to your Apple TV. Both the device and Apple TV must be configured to use the same iTunes account.
Configure a computer. In iTunes, go to File > Home Sharing and choose Turn on Home Sharing. Enter your Apple ID and password, then click Turn on Home Sharing.
Note: In Windows 7 and Windows 8, iTunes menus are hidden by default. To show them temporarily, press the Alt key.
Configure an iOS device. In Settings on the device, go to Videos or Music. Turn on Home Sharing, then enter your Apple ID and password.
Configure Apple TV. In Settings
, go to Accounts > Home Sharing. Turn on Home Sharing, then enter your Apple ID and password.
Stream content on Apple TV. Once you’ve configured all your devices using the same Apple ID, highlight Computers
on the Apple TV Home screen and press the Touch surface. Libraries from your shared devices appear, and you can view or play content from any library.
You can activate and use Apple TV controls in Control Center on an iOS device with iOS 11 or later.
Add Apple TV controls to Control Center. On the iOS device, go to Settings > Control Center, then tap Customize Controls. Tap the Add button
next to Apple TV in the More Controls list to add it to Control Center.
Open Apple TV controls in Control Center. On your iOS device, swipe up from the bottom edge of any screen, then tap the Apple TV icon
.
The controls in Control Center function the same as in the Apple TV Remote app. For more information, see Navigate with the Apple TV Remote app.
Take care.