How to download your rdio collection. Note that this might not be legal in your country. It also might be against rdio's TOS.

1. Open your collection and run this:

var data = {}; setInterval(function () { $('.item_link').each(function () {  data[$(this).attr('href')] = ''; }); }, 2000);

2. Scroll down, slowly, until you reach the end of the page

3. Run JSON.stringify(data) and save it as data.json

4. Install https://github.com/ravishi/rdio-dl

5. Run the script below with Node.js (replace username and password)

var fs = require('fs');
var execSync = require('child_process').execSync;
var data = JSON.parse(fs.readFileSync(process.cwd() + '/data.json', 'utf8'));
var failed = [];

Object.keys(data).forEach(function (key) {

  console.log(key);
  var path = key.replace('artist\/', '').replace('album\/', '');
  try { fs.mkdirSync(process.cwd() + '/' + path.split('\/')[1]); } catch (e) {};
  try { fs.mkdirSync(process.cwd() + path); } catch(e) { return; }
  process.chdir('.' + path);
  try {
    execSync('rdio-dl -u USERNAME -p PASSWORD "https://www.rdio.com' +  key + '"');
  } catch(e) {
    console.log(e);
    failed.push(key);
  }
  process.chdir('../../');
});