Watch the The Musical Alphabet online guitar lesson by Jeff Scheetz from Street Theory for Guitarists
You may already know your musical alphabet. It starts out just like the English alphabet - ABCDEFG - then repeats. 7 letters, so that translates into 7 notes. But, we have 12 notes in Western civilization music, so we need to add some sharps and flats between each note. But, the key thing to remember is this: No sharps or flats between B and C or E and F.