One way I've noticed that it has changed. Used to be you hear a song you fancied doing, it could take some time to find the lyrics and/or chords. Now at our club I notice someone does a new/unknown song, by the following week myself or others will have found it on line and learnt it. And repertoires are inceasing much faster due to the availability of songs, lyrics and versions on line. A drawback maybe is some songs get over perforned e.g lately every Tom Dick and Harry seem to be doing Dylan's Feel My Love, most pretty poorly!