Tribute bands come in 3 flavours; 1) full authenticity and a theatrical experience, like the Abba, Fleetwood Mac and Beatles tributes, dressing in period correct clothes, wigs, gear, mannerisms and accents, 2) a bunch of guys playing the songs with the original arrangements, maybe using the authentic gear, 3) another bunch of guys just playing the songs and that's it. They can be good or bad, but they all have their place and audiences.