Quoted from wingsman

Anyway, I've readed that one of the greatest live albums (if not the greatest) is Peter Frampton's 'Frampton Comes Alive!'. Does anyone have this album?

Every household in the seventies had this album. There were actual rumours at the time that it contained subliminal messages telling people to buy it, because no one could figure out while it was so popular. Live albums by unknown artists don't normally rocket to the top of the charts (10 weeks). The songs weren't bad I suppose, but it's big gimmick was Frampton's talking guitar. The performance and production were slick perfect and without the crowd noises could easily be a studio album. Thinking of it they were attributes not too common for live albums up to then and may have contributed to its  success.

They were groups that had more success with their live albums than with their studio ones. For example, Kiss, right? At least that's what I readed once.
Frampton Comes Alive! included some killer songs as Baby I Love Your Way or Show Me The Way. Songs that only gained airplay when they were released on the live format.
I like some of the Frampton stuff. I'm In You is one of my favourite songs ever.  

Another live album i loved , so much i got into the band by just hearing this album is
Bursting Out - Jethro Tull  

Others i played to death .

Song Remains The Same - Led Zeppelin.
Yes songs  - Yes .
All The Worlds A Stage - Rush .
Concert For Bangladesh - George , Bob and Co .
Ummagumma  - Pink Floyd .

In its day, everyone had 'FCA". Not bad at all, though its appeal would not be so strong today, I believe. Had to be there, I guess.