Turn

A turn is a musical ornament. A turn is an "S" shape symbol lying on its side above the staff. An inverted turn is the same, but also has a vertical line through the middle or the sign itself is turned upside down. If the turn is the note C, you would play a rapid alternation of (D,C,B,C). For an inverted turn C, you would play (B,C,D,C). When the turn is to the right of the note you would play (C,D,C,B,C). Always follow the key signatures for the upper and lower notes.

Mordent

A mordent is a musical ornament. An upper mordent is a short squiggle above the note. A lower mordent is the same, but also has a vertical line through the middle. If the upper mordent is the note C, you would play a rapid alternation of (C,D,C). For a lower mordent C, you would play (C,B,C). Always follow the key signatures for the upper and lower notes.

Trill

A trill is a musical ornament. A trill has a "tr" or a long squiggle above the note. The exact way to play trills varies depending on the piece and performer. If the trill is the note C, you can play an alternation of (C,D,C,D,C...) or (D,C,D,C,D,C...). How many times depends on the tempo of the piece. Always follow the key signatures for the upper and lower notes.