(happy upbeat music)
Hey and welcome to day three of Scratch Music.
Today you're gonna learn more computer science
so you can build a musical art display
like the one you see here.
When someone uses your musical art work
you'll be able to move the mouse around
to discover the different sounds that each color will make.
For this project, you use conditionals
or if-then blocks that tell the computer
what sound to play for each color.
You will create instructions that say for example,
if the mouse is touching green, play a C note.
Computer science is a tool that can be used
to build whatever you imagine in many different forms.
In these videos you'll see artists
who have used their computer science skills
to program innovative and interactive
musical displays for others to enjoy.
(ticking)
(upbeat music)
(warped soft music)
(bell ringing)
As you can probably guess from those videos
there were lots of if-then statements
used for behavior slide.
If the person touches the bike, then play a sound.
Sometimes it looks like the computer
is deciding what to do all by itself.
But in reality, every decision the computer makes
was programmed by computer scientists
just like you using statements
that say if this happens, then do a certain action.
You used several of these today to tell the computer
what note to play if a color's touched in your art.
In this first screen cast you're gonna sign into Scratch
and open the Starter Project.
To open your starter project
click the link next to the screen cast
that says Musical Art Starter Project.
Next you'll see a box
where you can enter your Scratch sign-in information.
To put a nest that will create and save a copy
of your Musical Art Starter Project to your Scratch account.
Then, click remix.
(swooshing) Take a look at this example
the interactive music display for today's project.
When the start flag is clicked
the circles randomly fill the screen with color.
When a mouse touches a green circle one note plays.
But when the mouse touches a different circle like blue
a different note plays.
The project creates the art but it requires a person
to interact with it to make music
just like those in the intro videos.
The notes you choose will change
the feel of your project and make it your own.
You'll also get the chance
to further customize the project in the add-ons.
Now it's your turn.
Open the Starter Project link on this page
and then sign into Scratch.
Once you finish this step
return to this CS first page and click the green arrow
to move onto the next screen test.
(upbeat music)
