Led Zep were one of the few bands that could really call themselves 'professional' (except with what they did in their 'own' time -

) in that they
'backed themselves up' ...musically
Eventually they 'sold out' to the USA commercialism, but they have had the best run of independent success based upon the music/songs that they made.
The fact that they never kissed Rolling Stone Mag's arse, is why Rolling Stones Band is considered a 'better' all-time great band. What a joke!
My Top 10 (no order)
Led Zep (like)<independent and creative>
Nirvana (medium like)<changed an entire music scene/era>
Pink Floyd (like)<creative and unique>
AC/DC (medium like)<staying power>
Beatles (don't like)<melody masters>
Metallica (medium like)<conquered their own scene>
Eagles (medium like)<America's most favourite>
Doors (medium like)<most dramatic>
KISS (medium like)<best 'entertainers'>
Spice Girls (major dislike) <best fabricated popularity merchandised>
in today's market of Downloads etc. If I was a Band Manager, I will tell the band to forget doing Music Videos or making CD's - just "get out there and play" for the crowds that bother to come and hear you. Let word of mouth be the wave you ride.