If the purpose of using the copyright work is for educational purposes, and it's being distributed as a class handout, the use is permitted under fair dealing. You may copy the entire poem or musical score for the purpose of education.
Book
If the purpose of using the copyright work is for educational purposes, and it's being distributed as a class handout, the use is permitted under fair dealing as long as you may copy approximately 10 per cent or a full chapter.
Audiovisual (Film, TV Show), Sound Recording
If the purpose of using the copyright work is for educational purposes, and it's being distributed as a class handout, the use is permitted under fair dealing. You may present an audiovisual or sound recording in class as long as the copy was obtained legitimately (e.g., owned, borrowed, rented) and your audience consists primarily of students, instructors, or any person who is directly responsible for setting curriculum for the school.