The phrase "to follow those notes" means to listen or pay attention to what is written or said, and to do or understand it accordingly. Full definition
Following the notes in the margins of their returned manuscripts has been a common path to success. (authormarketingclub.com)
The company was earlier rumored to discontinue the Note series entirely following the Note 7 scandal, but the presence of a Note 8 device is becoming more evident every day. (ibtimes.com)
Ubisoft's title follows a similar idea with gamers playing along with songs by following the notes on screen, but this time, gamers are given an actual guitar. (game-designschools.com)