+Relative mode can be confusing initially, but is the easiest way
+to enter most melodies. Let us see how this relative calculation
+works in practice. Starting from a B, which is on the middle line
+in a treble clef, you can reach a C, D and E within 3 staff spaces
+going up, and an A, G and F within 3 staff spaces going down. So
+if the note following a B is a C, D or F it will be assumed to be
+above the B, and an A, G or F will be assumed to be below.
+
+@lilypond[verbatim,quote,ragged-right]
+\relative c'' {
+ b c % c is 1 staff space up, so is the c above
+ b d % d is 2 up or 5 down, so is the d above
+ b e % e is 3 up or 4 down, so is the e above
+ b a % a is 4 up or 3 down, so is the a below
+ b g % g is 5 up or 2 down, so is the g below
+ b f % f is 6 up or 1 down, so is the f below
+}
+@end lilypond
+
+Exactly the same happens even when any of these notes are
+sharpened or flatted. @notation{Accidentals} are @strong{totally
+ignored} in the calculation of relative position. Precisely the
+same staff space counting is done from a note at any other
+position on the staff.
+
+To add intervals that are larger than three staff spaces, we can
+raise the @notation{octave} by adding a single quote @code{'} (or
+apostrophe) to the note name. We can lower the octave by adding a
+comma @code{,} to the note name.