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@ShirleyM1120 & @CeeDubya Welcome to the TAC community. Both great questions. @Niv gave a great explanation to the 12 bar blues. As for the tabs not matching what Tony’s playing, that happens occasionally. I think that the tabs are developed separately from the videos, and he may not have had the tab to reference when doing the video, or his notes were written at a different time than the tabs – could be a number of things, but you can play it either way. Tony’s or the tab. I tend to just follow the tab.
Cee, as for the 120, that refers to bpm, or beaTs per minute. If you have a metronome app on your phone, or you Google metronome, you can put it to the 120, and depending on whether the music is time stamped 3:4, 4:4, 6:8, 8:8, etc., which tells you how many beats each measure is typically quarter (4), eighth (8) or 16th, bit it can be a 3 or 32. Here’s a site that explains it better than I do. https://www.musicradar.com/how-to/ultimate-guitar-tab-guide The time stamp will tell you how many beats there are per measure. The bpm tells you how fast to play each measure. The easiest way to practice at the correct time stamp and bpm is to use a metronome, which you would set up by inputting the time stamp and bpm. It then taps out the bpm. It’s a tool that I suggest using . It will help greatly with playing songs correctly.
https://www.musicradar.com/how-to/ultimate-guitar-tab-guide
musicradar.com
The ultimate guitar tabs guide: how to read tab and symbols explained
Learn to play acoustic and electric with our guide to this easy-to-read notation