There are two types of modern songs (even if they are not folk songs) that will often get my approval. Ones that make me want to sing them - good tunes and rhythms - eg Lightfoot's "Boss Man" even if the lyrics are in many places simply wasted opportunity. One that make me say to myself "Yeah, that told them", sometimes from say Billy Bragg. Tolpuddle Man (not Bragg, of course) is an excellent example, and it has a cracking tune to boot. Country Joe's "Who am I" also has both. So does "The Fish Cheer".