Welcome to the foundation for your Echo Nest application.

You will want to create a settings.rb file with the following:

API_KEY='yourechonestapikey'
SECRET='somekindofrailsappsecretthatisalphanumericandverylong'

Get an Echo Nest API key by visiting the (Echo Nest Developer Site)[https://developer.echonest.com/account/register].

You can generate your SECRET on your own. Look in previous Rails apps that you have made for an example.

Try a few methods out once you have your settings.rb file set up...

s = Song.new
s.search(:artist => 'green day')
a = Artist.new
a.search(:name => ['green day'])

Additional methods and documentation with arguments can be found in

app/models/song.rb
app/models/artist.rb

That's it! Have fun!