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{{Beginner Lesson Crumbs|8}}
Playing on a single string is a complete pain. You are constantly changing positions, restricted to simple melodies, and cannot create any harmony. Let's add another string: the '''2nd string''' or '''B string'''. Below you can see both the notes of the 1st and 2nd strings together.
E--0--1--3--5--7--8--10-12--
B C D E F G A B
If you look at the 2nd string frets that fall in are used for the C major scale, you'll notice this is identical to they're the same ones as the 1st string frets, except here we use the 6th fret instead of 7th. On the 1st string, that note is a B - the leading tone, which is a semitone below the tonic note. Here, that note is an F, the 4th, a whole tone below the 5th.
Remember that the 1st string is tuned a fourth 4th above the 2nd string. E is a fourth above B. As we go up the fretboard, we see each note on the 2nd string has its relative 4th directly above it on the 1st string. Starting with open we have:
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Now that we have two strings to play simultaneously, we can start to explore the concept of '''intervals ''' and how they drive all harmony.
== PreReqs ==