Dedicated electrical lines


I'm trying to get an electrician to install 3 dedicated lines to my music room. The room is about  140 ft from the circuit box . The lines would likely have to go along the inside of my flat roof and then into the drywall . There are spaces for three lines in my circuit box. What seems like a reasonable estimate for that work? 
keithjacksontucson
That’s not 140 ft in a straight line. It’s 50 to one corner and then 90 ft to the room.
 I have a 50 amp line in a conduit underground to a box  where a hot tub used to be. Would it be easier to extend that line 90 ft to my music room  under ground and then up through the stucco and dry  wall?
 I just got quoted $5500 for the job the other way, which seemed very high to me. The roof was his idea.
I though I could get some ideas from someone here before I get more estimates
thanks



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I though I could get some ideas from someone here before I get more estimates


its a little hard to get ideas when this is something you would have to see in person or lots of pictures to get an idea of what you want to do.