The oldest orchestra west of the Mississippi, the Oregon Symphony was founded under the name Portland Symphony in 1896. The orchestra moved to its current home, Arlene Schnitzer Concert Hall, in 1984, becoming a full-time rather than part-time orchestra. Today, it is made up of 76 professional musicians who play over 60 concerts each year, from September through May. Guest musicians and conductors are frequently invited to perform with the orchestra. While most performances are held at the Schnitzer in downtown Portland, the orchestra also has two outdoor concerts during the summer and occasionally travels to other communities throughout Oregon.