Instructing, occurs in the title of thirteen Psalms (32, 42, 44, etc.). It denotes a song enforcing some lesson of wisdom or piety, a didactic song. In Ps. 47:7 it is rendered, Authorized Version, "with understanding;" Revised Version, marg., "in a skilful psalm." (song of wisdom), the title of thirteen Psalms 32,45,44,45,52-55,74,78,68,69,142 Ewald regards (Psalms 47:7) (Authorized Version, "sing ye praises with understanding; " Heb. maschil) as the key to the meaning of maschil, which in his opinion is a musical term denoting a melody requiring great skill in its execution.
Maschil