What three things do you need to have an improvisation?

What is an emphasis or stress placed on a note called?

I'm dying: a couple going on vacation but his wife was on a business trip so he went to the destination first and his wife would meet him the next day. when he reached his hotel, he decided to send his wife a quick email. unfortunately, when typing her address, he mistyped a letter and his note was directed instead to an elderly preacher’s wife whose husband had passed away only the day before. when the grieving widow checked her email, she took one look at the monitor, let out a piercing scream, and fell to the floor in a dead faint. at the sound, her family rushed into the room and saw this note on the screen: dearest wife, just got checked in. everything prepared for your arrival tomorrow. p.s. sure is hot down here.

The opening section sounds marchlike, with accented beats and alternations between instrumental groups. eventually, a total change of character marks a short, new section. at approximately which time interval from the beginning does this appear?