Looking into Musicals and Futher planning

I have had a think about what the best way of finding out the appropriate target audience for a musical magazine,  the main aspects i was thinking of was:
- what type of musicals there are on in the west end currently. (stereo typically thinking if they are aimed at both genders or just one or the other )
I re-serached a list of what musicals are currently on the west end and this is what i found:

BACKBEAT

BILLY ELLIOT : THE MUSICAL

BLOOD BROTHERS

CHICAGO

CHRISTMAS WITH THE RAT PACK LIVE FROM LAS VEGAS

CRAZY FOR YOU

DREAMBOATS & PETTICOATS THE MUSICAL

GHOST THE MUSICAL

JERSEY BOYS

LEGALLY BLONDE THE MUSICAL

LES MISERABLES

LION KING, THE

MAMMA MIA

MATILDA THE MUSICAL

MIDNIGHT TANGO

MILLION DOLLAR QUARTET

PHANTOM OF THE OPERA,

PRISCILLA QUEEN OF THE DESERT - THE MUSICAL

RAGTIME

ROCK OF AGES

SHREK THE MUSICAL

SINGIN' IN THE RAIN

SWALLOWS AND AMAZONS

THE RAT PACK LIVE FROM LAS VEGAS

THE SUIT

THRILLER LIVE

WE WILL ROCK YOU (Queen Musical )

WICKED

WIZARD OF OZ, THE However,i was thinking that i could also add in to the magazine classical musicals such as Oliver Twist, Sound of Music and Mary Poppins. Even though they are not currently on the west end, i think that the buyers of the magazine are people who are into musicals so are bound to have seen the classics.  - Also money is another factor of the age who they magazine is aimed at. I do not think that a 18 year old would have enough money to be frequently visiting the theatre. However, there still are shows which are based at that age group, such as legally blonde, so maybe musicals are. However, the age group for Legally blonde is wide as i have seen from personal experience, because when i was in the audience, there were 18/19 year olds but also families with teenage children and older people were in the audience.  I was thinking of ways to find out who the magazine would be based at. I was thinking of a questionnaire but i think that it is a bit of a hassle and people never return them on time, or they get lost. So i thought of an idea to choose 3/5 people from a few different age groups and verbally asking them a few questions and getting into a little conversation about if a musical magazine is something which appeals to them and if so, what would they want it to include.  So firstly, i thought of the age groups i could speak to and i made a decision of: up to 14 15-24 25-34 35-44 45-60 60+ I will make a table for when i speak to the different ages and then i will scan it in once i finish interviewing all the people and then write up a conclusion and hopefully the conclusion will involve the age group i will aim the magazine at. The questions i want to bring up in the interview is firstly, does a musical magazine appeal to them and if they would buy it, how often they go to the theatre, who they usually go with, what sort of play they see, if the old classics are something which appeals to them and if they  are they interested in the back stage gossip.