Would it be possible to make an arrangement of a musical

Dear Lady, Dear Sir,

I am the conductor of 2 great windbands in Switzerland. We are looking about doing a special event in 2021. One idea was to make a concert version (with choir and soloists) of a musical. How can we get the authorisation to make such arrangement for windband ? If possible. I was thinking about « les misérables ». Or if authorisation for  « les misérables » is impossible, could it be possible for another show and which one? 

Thank you fir your help,

best regards ?

Christophe