(2/1 + 8/4 + . + @) - 8/1 = email address
Vaya mierda, ya no puedo participar

Bueno, si alguien está intentado esto (que lo dudo

) que sepáis que el mail es
----------@muse.muLa primera parte es la que hay que resolver, claro; la segunda la han terminado dando ellos después de ver como la mitad de la gente enviaba sus datos personales a vete tú a saber quién
EDIT: Ya están los ganadores. Solución:
Right heres the answer for you all:
So we're told in hint 2 to not forget hullaballoo which means it revolves around albums so then:
2/1 = Muscle Museum (2nd Track, First Album)
8/4 = Hysteria (8th Track, 4th Album)
8/1 = Uno (8th Track, 1st Album)
We are also told that the domain is @muse.mu so that removes '@' and the '.' from the equation.
Muscle Museum + Hysteria - Uno
And because we know muse.mu is in it, then we can see that they are contained within muscle museum so we remove those from the equation too.
Schleum + Hysteria - Uno
Uno = 1
If you remove one letter from either of schleum of hysteria you get 13 letters, 13 is the number of the x's.
If you remove 'U' you get schlemhysteria, which is an anagram of mystichealers(@muse.mu) which is an alternative medicine