Delius: 2 Aquarelles: No. 1. Lento, ma non troppo (English Chamber Orchestra; Julius Lloyd-Webber, cond.)
The membership of the three different kinds of orchestras are the same: strings, winds, percussion. On any given night, however, depending on the demands of the music, even a symphony orchestra might appear in a smaller form. Far fewer musicians are needed for a Haydn symphony than for one of the great 19th century masterworks. What’s different is the kind of music that they play.
Sibelius: Suite champêtre, Op. 98b: III. Danse (Tapiola Sinfonietta, Tuomas Ollila-Hannikainen, cond.)
All sizes of orchestra can play the music of the Classical / early Romantic era – the forces called for are within the capabilities of even a chamber orchestra. By the time we get to Mahler, however, only a symphony orchestra could tackle his largest work. Mahler’s Symphony No. 8, nicknamed the “Symphony of a Thousand,” requires an extended string section, extended woodwind and brass sections, extra percussion, an organ, 7 solo singers, chorus, children’s chorus, and a separate group made up of 4 trumpets, 3 trombones, harmonium and mandolin. There are parts for 2 harps but Mahler preferred to have 4 harps. It really doesn’t require a thousand players, but it is possible to do a performance, in a very large space, with a thousand. This is clearly impossible for a chamber orchestra to tackle.
Mahler; Symphony No. 4: I. Bedachtig, nicht eilen (London Symphony Orchestra, Valery Gergiev, cond.)
Chamber orchestras, on the other hand, are very well suited for smaller works where the emphasis is not on the power and might of the orchestra but on the interplay of lines and the delicate changes in timbre. In a piano concerto, for instance, the pianist can have a different relationship with a chamber orchestra: instead of it being piano versus orchestra, each can take up its own idiomatic line and create a work that’s more delicate. Often when you have a piano concerto performed with a symphony orchestra, a lot of effort is made by the pianist to carve its own audio niche out of the massive orchestral sound.
If you are in a city that has multiple sizes of orchestra, revel in the differences in their sound and the music they play. Each will cause you to hear the music differently and even to hear different music.