the early works of the Indigo Girls is usually safe enough..
Indigo Girls : Lyrics
Indigo Girls - Album: 1200 Curfews - Playlist
and some of the most annoying pop songs have been converted into folky/country versions. . .
Steve Poltz has a talent for that, but also comes up with some inspiring (and less so; number 9 is a better start.. although 12 sounds like a campfire song.) works of his own;
Steve Poltz Live at American Legion Hall on 2006-04-08 : Free Download & Streaming : Internet Archive
Victoria Williams ... maybe Century Plant?
songbooks for Simon & Garfunkel are easy to find.. more than a few catchy ones there and most are easy to play.
same with unitarian universalists - a blending of traditional hymnals, sometimes of abrahamic religions, sometimes not.. some non traditional songs make their way into those circles. many may be appropriate for a campfire setting;
https://www.youtube.com/results?search_query=unitarian+universalist+song
and there's always showtunes.. every dreadful earworm that will haunt one and all for ages to come. 1940s to 1960s were really the best years... usually a good set of years to send teens into eye rolling seizures.
The 1970s disco for catatonia & 1980s pop for suffering second hand embarrassment.
The 1990s just causes a generational rift between the GenX'ers with their apathetically angsty nostalgia and the millennials everyone just wants to smack -- there's quite few quirks of the decade in every genre, but it's also the height of the disney's animated musicals -- perhaps not easy to learn but it does tend to be in the collective consciousness... inescapable soundbytes.
after that? there's the indie, emo scenes.. but it all gets a bit screechy.
Minnie Driver - Seastories
a more dementedly cheerful little ditty:
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