Randomly generated competition draw with priority for players that has preference

Question

(1) INPUT
player# ColumnA
Preference
1 player1 
music
2 player2
3 player3
music
4 player4
music
5 player5
singing
6 player6
7 player7
8 player8
(2) my original requirement was to pair the players randomly, so i used following solution. 
In E1 i have RAND() for 1000 rows (E1000),D1 I have 128 teams
In A1 used this formula
=IF(ROW()-ROW(A$1)+1>$D$1/2,"",RANK(OFFSET($E$1,ROW()-ROW(A$1)+(COLUMN()-COLUMN($A1))*($D$1/2),),$E$1:INDEX($E$1:$E$1000,$D$1)))
copy across to B1 and down as far as you might need.
Assuming you have 128 in D1 then A1:B64 will now include one each of numbers 1 to 128. Subsequent cells will be blank. Change D1 to any even number to regenerate numbers. Note: recalculation of worksheet will re-generate random numbers, hide column E if you
wish
(3) So now i have a new column called PREFERENCE that has preference / interests that players have set.
I want to enhance above formula to give priority to players who have set preferences and do their pairing first with other players who have the same preferences.
If there are no players that have matching pair per perference (e.g singing in above example) then do random match.
If there are no preferences set then simply follow the logic that i have shared above for random pairing.  
Appreciate your help!!

Answer 1

Hi JainPaddy,
Thanks for posting in MSDN forum.
Based on the description, you are design a workbook with formula. I would like move it to
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