If you copy and paste an article or a song and don't say much on your own, it's probably plagerism. I'd expect someone to say why they like the song, what it means to them, something about the artist, a story about it, etc. Dropping a link and saying good reggae #Jahm isn't necessarily plagiarism but it's very low effort.

Usually I try to link it with some activity since I do t know much about music but I like listening to music while doing other things that are interesting enough to blog about. Talk about beer and reggae, travel, jogging, dancing, driving to work, whatever makes you happy.