It never was so easy before !
A lot of records from the biggest store are available for you right now. Without accounts, registrations, authentications and other annoying things !
1. Type the name of the track or the artist name in the search bar in the upper right corner.
2. Choose the record you like from results.
3. Download mp3-file with the record.
4. Enjoy !
But keep in mind: if you like a record and want to continue listening it you must buy it in a official store. Records from this services are for testing on devices you use for listening.
You can download a few mp3 for free but many for a little payment.