Grabbing Get option function from php file in plugin folders

Hi Everyone

Really need some help i am making a plugin within the main plugin i have the code.

// Some Defaults
$bucket = ‘music’;

// Put our defaults in the “wp-options” table
add_option(“isd-bucket”, $bucket);

so thats great for me i no it adds to the database music.

the problem i am have is i need to pull that out off the database into another file in my plugin folder.

in my playlist.php i have.
echo get_option(“isd-bucket”);

problem is when running this file i get.

Call to undefined function get_option() in

I understand this probably means i need to require other files so it intergrates with wordpress i have tried many options but cant get it to work plese help.

Thanks