Rudy's Book I
Fairly easy songs that most people can sing along to. This could be under campfire music too!
Beatles, Eagles, Bob Marley, Kid Rock, Traditional, Steve Miller Band, Everly Brothers, Cat Stevens, Johnny Cash, George Harrison, Violent Femmes, Guns N'Roses...
All of the songs that have been rehearsed, performed, and/or attempted by the Riverside Ukulele Liberation Front at least as far as I can remember
Daniel Boone, Bruce Springsteen, Traditional, Tally Hall, John Lennon, Tom Waits, David Bowie, Garth Brooks and Woody Guthrie