Select all the percussion instruments that are classified as indefinite pitch.Multiple select question.pianotriangleIdiophonetom-toms

To address the question of selecting percussion instruments classified as indefinite pitch, let's first clarify the definitions:

1. Indefinite Pitch Instruments: These are percussion instruments that do not produce a definite pitch (a specific musical note). Instead, they produce a sound that is more about the quality of the noise rather than a defined note.

2. Definite Pitch Instruments: These are percussion instruments that can produce a specific pitch or note.

Analysis of Options:

1. Piano: This is a string instrument that produces definite pitches, so it's not classified as indefinite pitch.
2. Triangle: This is an idiophone that produces an indefinite pitch when struck, as it doesn’t resonate a specific musical note.
3. Idiophone: This is a category of percussion instruments that produce sound through the vibration of the instrument itself. Some idiophones can be indefinite pitch (like a triangle).
4. Tom-toms: These are membrane instruments that usually tuned and can have definite pitches, but typically they are more often used for their rhythmic qualities rather than specific notes, thus having varying degrees of pitch.

Final Selections:

• Triangle (Indefinite pitch)
• Idiophone (Depends on the specific instrument, but can include indefinite pitch examples)
• Tom-toms (Generally considered to have indefinite pitch for practical performance)

Summary:

The percussion instruments classified as indefinite pitch in your selection are:

• Triangle
• Idiophones (relevant examples)
• Tom-toms (context-dependent)

Final Answer: Select Triangle, Idiophone (where applicable), and Tom-toms as instruments with indefinite pitch.