```js
const albums = require('express').Router();
const tracks = require('./tracks').Router();

//...

albums.get('/', function(req, res, next) {
  // send our response here
});

albums.get('/:albumId', function(req, res, next) {
  let albumId = req.params.albumId;
  // retrieve album from database using albumId
  // send response with album data
});

// The fix for our parameters problem
albums.use('/:albumId/tracks', function(req, res, next) {
  req.albumId = req.params.albumId;
  next()
}, tracks);

//...

module.exports = albums;
```