The number of musicians in the orchestra is 11 + 12 = <<11+12=23>>23.
The number of musicians in the band is 2 × 23 = <<2*23=46>>46.
The number of students in the choir is 12 + 17 = <<12+17=29>>29.
There are 23 + 46 + 29 = <<23+46+29=98>>98 musicians in total.
#### 98