We strongly advise against the second category. Not only do illegal downloads hurt the artist (especially an independent legend like Armatrading), but they also expose your device to malware, poor audio quality (often 128kbps or lower), and incorrect metadata.
This response uses data provided by Google's Knowledge Graph Joan Armatrading – True Love Lyrics - Genius true love by joan armatrading mp3 download
If you still use an iPod or prefer AAC files (which sound identical to MP3 and work on all devices), iTunes is a reliable option. Note that iTunes sells .m4a files, but you can easily convert them to MP3 via iTunes settings if needed. We strongly advise against the second category