Some note heads can only be placed on staff lines. These include the following:
1) Accidentals, which are notes that raise or lower a pitch by a specified semitone.
2) Dots below notes, which specify how long to play an individual note before it is shortened by one-half its value unless otherwise indicated in parentheses.
3) Double dotting of notes, which means to lengthen the duration of a note by two times its original value (dotted whole note).
4) Multiplication sign between numbers and dots under them, specifying that a dotted quarter should be performed as three eighth notes rather than four sixteenths (eighth triplets).
5) The tie, which means that the two notes it connects should be played as one long note (usually a quarter).
Your turn: Accidentals are notes that raise or lower a pitch by a specified semitone. For example, if you need to go up an octave on your instrument and from low C to high C, then use the accidental F sharp instead of F natural because this will make for a much easier transition in pitches; but if you want only to go up three half-steps from D to E flat, then don’t worry about using any accidentals at all. You can also use sharps when going down in order not to have too many flats or more than three consecutive enharmonic keys.