How to wake up to music with Linux

“I remember that, to finish my thesis, I had to get up at 3AM
for over two weeks. I had to sleep in my office and I used my
computer to set and fire several alarms: one to play a song at the
desired time, another one to launch the browser, and a third one to
open the thesis document. Back then, I thought Windows was a great
OS because I was able to do all that. However, to be honest, it was
not Windows that was doing the trick, but third-party software.

“Now that I migrated to Linux, I realized that you can achieve
exactly the same but directly from the OS, that is, without
resorting to third-party software at all.

“This is the way to do it:

“1. Before the OS loads, press the key that the computer tells
you to get into the BIOS. It can be DEL, ESC, or any other key that
the system indicates. You have to press it quickly; you will be
taken to a screen that looks like this:

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