How to create a webcrawler in scrapy to fetch .mp3 links

I want to make a webcrawler that can fetch .mp3 links from a website. However the content is dynamic in the example site http://raagtune.net/ . In this site the content is fetched from "http://ift.tt/2jXdwq3.. some random .mp3" how can we crawl the entire site and get all MP3 links using scrapy in python? Or is there any alternative methods?