(upbeat music)
Hey, and welcome to Scratch Music.
Today you'll learn how to use a forever loop
and explore how to create movement in Scratch
while building a dance animation.
Today you'll learn about an important
computer science concept; loops.
A loop is simply a set of instructions
that repeats over and over.
At many computer science concepts,
loops exist all around you.
In music, repeated musical phrases are called ostinatos
in appearing throughout a song, like the repeated notes
in the famous Jaws scene.
(Jaws theme music)
Advanced choreography also contains
excessive repeated movements
that are like loops.
Even your daily routine can be seen as a
repeating set of instructions, such as:
getting up, eating breakfast,
going to school, coming home, and going to bed.
You will repeat those same set of instructions
the next day and the day after that.
Repeat forever loops tell the computer
to follow the same set of instructions over and over again.
In today's dance party project (hip-hop music)
you use forever loops to make Cassy dance forever
to music that never stops playing.
You use a forever loop to make both the music play,
and to make Cassy dance.
In this first screencast, you will sign into Scratch
and open the Dance Party Starter Project.
First, watch as the the screencast walks you through
the steps and do them on your own.
To open the starter project, click the link
next to this screencast that says
Dance Party Starter Project.
You will see a sign in box where you
can enter in your Scratch sign in information
and create and save a copy of this project
in your Scratch account.
Afterwards click Remix.
Now it's your turn.
Go ahead and open the starter project link on this page
and sign into Scratch.
Afterwards click Remix.
Once you've finished this step return to this
CS First page and click the green arrow
to move onto the next screencast.
