The introductory piece of music for a long composition is usually called the "overture."

Seniors will be very excited to be finished with school. The introductory speech should be fun and full of promise for a bright future.

Rather than beat around the bush andmaking your subject matter a mystery to the reader, an introductory sentence identifies your theme.

yes

The introductory paragraph about the jobs that you most enjoy should include what characteristic you enjoyed most. You should also include your basic personality information.