The first ringtone was a bell ringing.
Here and there, people made special devices to plug into the line to make different sounds, but pretty much everyone had a bell in their phone.
Then came wireless home phones and fancy novelty phones which beeped, chirped, and made other simple sounds.
So did the first cellular phones.
They evolved through simple MIDI sequences to brief low-fidelity recordings to sound clips, and eventually songs you could download and set to each of your contacts.
But never pick a song you love with all your heart.
Eventually, you’ll get sick of hearing it.