Apple has decided to remove the Macintosh boot chime (or f-major tone) that has been a staple of the Macintosh since 1998. Apple also removed quite a few of the other iconic features that has made the Mac identifiable including USB ports, the glowing Apple logo and physical function keys, which were replaced by the fancy new Touch Bar.
To reenable the iconic MacBook startup chime, head to the Terminal, located in the Applications —> Utilities folder and type in this line (and then enter in your admin password):
sudo nvram BootAudio=%01
Hit return and you should now hear the tone at every startup. To turn it off, type in this line:
sudo nvram BootAudio=%00