Another question. Ive been looking at other common progressions to mess around with, and on this pdf i found
http://www.jdarks.com/files/Chord_Pr...Chords.com.pdf page 12, the common I-IV progression, the person shows it as C / / / F / / / C / / / F / / /. Do you know what the slashes mean. Are they rests or mutes or something?