A quick pair of questions.

(a) Who are 2B/37 better known as?
(b) Who 'composed' 91π/216000?

Source: GCHQ Puzzle book

This question has an open bounty worth +100 reputation from user477343 ending in 6 days.

One or more of the answers is exemplary and worthy of an additional bounty.

I am awarding 50 reputation to @KevinL's answer because his answer deserves it, and another 50 because he is nice. That is 100 reputation in total! :D

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    Are we looking for a single answer or is it two separate questions? – rhsquared Sep 14 at 8:04
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    It is two questions..... – Anush Sep 14 at 8:28
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    If they're not part of the same puzzle, they should probably be posted separately. – 3D1T0R Sep 14 at 16:19
up vote 31 down vote accepted

2B/37 (base 16) = 43/55 (base 10) = 43*4/55*4(base 10) = 172/220 (base 10) = AC/DC (base 16)

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    I think it is just 2 separate questions :D – Kevin L Sep 14 at 8:58
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    So the real challenge is for the OP to accept both answers. – Mr Lister Sep 14 at 12:47
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    @MrLister I can't even tell which answer was first any more! – Anush Sep 14 at 14:18
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    @Anush this answer was first by a little over a minute. You can see exact timestamps by hovering over the "Answered X hours ago" text. – David Starkey Sep 14 at 14:20
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    Is it weird that I'm bothered by the unnecessary conversion to base 10 and back? I mean, hex is just another format for representing integers... Then again, it does help make this answer a little more clear. +1 either way for the clever solution. – Nic Hartley Sep 14 at 21:08

For B)

It was John Cage
91 x (pi) / 216000 rad will give 4'33"
John composed the piece 4'33"

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    If I can, I will give a $50$ rep bounty to this question and award you that :) – user477343 Sep 15 at 12:30
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    @user477343 Wow, thanks :D – Kevin L yesterday
  • There we go :P ${}$ – user477343 yesterday
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    @user477343 Dude, you are such a nice person :) – Kevin L yesterday
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    @user477343 Well, thanks a lot :D – Kevin L yesterday

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