Harmony 4: What does this accidental mean??

An accidental CANNOT BE IGNORED!! You must explain why there is, all of a sudden, an accidental on the page. This can easily be done if you study the following guidelines.

A Raised accidental usually means:

1) the leading-note of a minor key

2) the leading-note of a new key

3) a non-chord note (only on a weak part of a beat and if none of the above apply)

4) the middle note of a Tierce de Picardie (very rare in Harmony 4)

A Lowered accidental usually means:

1) the subdominant (note IV) of a new key (within a V7 or its inversion of a new key)

2) the last note of a VII diminished 7 chord in a major key

3) a non-chord note (again, only on a weak part of a beat)