Helen, if you can read the dots (and it appears you can?), you can learn ABC easily. As in 5-30 minutes.

You can find a good brief description of ABC at John Chambers's <http://trillian.mit.edu/~jc/music/abc/doc/ABCprimer.html> and the official website describing abc completely is at <https://abcnotation.com/>. It has links to LOTS more info, including several YouTube videos for beginners. (I haven't seen them, so can't comment on their quality.)

If I've understood you correctly, below is the ABC for your intro. I also dropped it into a notation program, listened to it, and didn't recognize it. But if I've misunderstood you, then that would obviously be the case.

%abc-2.1
X:1
T:Unknown Rock Song
M:4/4
L:1/8
Q:1/4=150
K:G treble

Gg4ze2 | Ga4ze2 | Gb4ze2 | Gc'4ze2 |

I've also dropped it by an octave so it has fewer notes on ledger lines. This is not necessary, just my own preference. This also has the effect of making the ABC be slightly shorter: about 8 characters?

BB,
NightWing