A piano trio typically refers to a composition written for three instruments, usually consisting of piano and two string instruments, commonly a violin and a cello. However, it's worth noting that the term "trio" can sometimes refer to different instrumentation, depending on the context.
Here are a few common formations that might be considered trios:
- Piano Trio: Piano, violin, and cello.
- Piano and Orchestra: This is not a trio in the traditional sense, but rather a concerto for piano with orchestral accompaniment.
- Piano Duo: Piano and another instrument (such as a clarinet or flute), alongside a third instrument.
- Vocal Trio: Piano accompanied by two voices, often seen in choral or vocal arrangements.
If you're looking for a specific type of trio, please clarify, and I can provide more information!