Inkspot] Title of a piece of music? No
irach - Alexander's Ragtime Band? No

Time for a summary? The answer is a group of people with something in common, mostly male. The 'something in common' has connection with rock music, and takes its name from a specific human, but it's not a group. Questions about this involving religion, sexual activities, and being dubious have all drawn giggles or sniggers from the audience. It's not a relationship by blood, or connected with the military (though there was a connection once - sorry, should have noted that earlier), or a charity organisation. It's sometimes done for money, and it may well involve drinking. There's no connection with a particular time of year, and only a jokey connection with journeys.
Writing all that out makes me think that it's glaringly obvious, but perhaps I shouldn't be cruel ;)

Rosie - Elvis impersonators? YES! So as Rosie was the question-setter before me, the baton is returned to sender.

(Irouléguy) - Actually it was the Lactulose I handed you and you are gracious enough not to hand it back, though I hope you haven't drunk it. I'm told it's rather persuasive.

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Right, this one is ABSTRACT, and absolutely nothing to do with steam locos.

Sorry Rosie if the question is a bit broad, but what I mean is something like magetism or a black hole.

(Inkspot) - It probably could, but the answer to your question as you intend it is NO.
(irach) - Human element? YES.

(Quendalon) - No mathematical element.
(Raak) - Not a philospohical idea.

(CdM) - Not connected to the brain.
(Raak) - Not an arrangement of concrete things. You mean physical, I assume.

(Rosie) So there's a human element, but no Animal connection?

(Quendalon) - Hmm, difficult. Let's say each one is. But that's not very helpful. It needs humans for this abstract thing to manifest itself, so there is an Animal connection, an omission on my part.

Rosie] Thanks :)

(Tuj) - Does not begin with a P.
(Irouléguy) - Nice thought, but not sin. What would I know about that?
(Raak) - Not an activity.

(Quendalon) - Not connected with the body.
(Kim) - Connected with the arts? It can be on occasions.

(Quendalon) - NO! Er, sorry, no connection with emotion.
(Chalky) - Nothing to do with weather.

(Kim) One or two branches of the arts at most. The connection is not a vital part of this, but occurs.
(Chalky) - Not connected with the occult.

(Quendalon) - Connected with sound? - Yes