Of course, these comparisons can also be helpful if someone who plays a different instrument wants to join in with an ensemble that’s mostly recorders. A flute player sitting in with a recorder consort would generally play an alto or tenor part, for example. A violinist would probably play an alto or tenor part, but lots of the time they could even get away with playing the bass line if they don’t mind reading up an octave in bass clef!
So far, all of these scenarios assume that you’re playing in the same octave as you would if you were playing any other instrument. This is important in many cases, such as if you’re playing an inner voice in a polyphonic piece or if you’re playing a duet part with another instrument. Playing your part up an octave when no one else is doing so would interfere with how the counterpoint is written.
There are also times when the octave doesn’t matter so much, or when it can be helpful to go up an octave. If you’re playing the top line in a polyphonic piece, it doesn’t disrupt the counterpoint as much when you go up an octave because although you are farther away from the other parts, you haven’t changed the part order the way you would if you changed the octave of an inner voice. So the blend is different, but it can often work.
Playing up an octave some of the time can also add brilliance and variety to the sound of the ensemble for orchestration effects - for example, you could double another part in octaves on the repeats or in the louder sections. It’s particularly good for descants or soloistic material, or any other time when you need your part to stick out of the texture more instead of blending in.
And then there are cases where the octave you’re in is just a part of your sound. Playing fiddle tunes in a dance band can work great on either soprano or tenor, depending on the sound you want, and switching between the two can create exciting variety.
Every scenario is a little different, and sometimes you’ll be balancing competing goals - being heard versus blending in, or staying in the right octave versus working with the instruments you have available. Don’t be afraid to experiment! Sometimes breaking the rules can work when you don’t expect it! Give it a try, and see what you get.
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