Final answer:
The compound predicate is 'practiced piano and played the guitar,' with 'The brothers' as the subject. In music, physical characteristics of instruments often indicate pitch, and mnemonics assist in learning musical notes.
Step-by-step explanation:
The compound predicate in the sentence 'The brothers practiced piano and played the guitar' consists of two verbs: 'practiced' and 'played'. These verbs share the same subject, 'The brothers', and are joined by the conjunction 'and' to form a compound predicate. A predicate tells us what the subject does or is, and a compound predicate means the subject is doing more than one thing.
To help students select the correct verb to complete each sentence, we would need additional context for the sentences provided. However, understanding the parts of a sentence, such as the subject, predicate, or intransitive verb, can provide students with clues for correctly completing the sentences. Optional adverbials, like 'on Friday' in 'We went to the bowling alley on Friday,' give extra information about the action or verb.
When closely observing musical instruments to determine which plays high-pitched sounds and which plays low-pitched sounds without hearing them, inspect the size and thickness of the instruments' strings or the length and width of their air columns, as smaller and thinner often produce higher pitches.
For learning musical notes on the treble clef, mnemonics like 'Every good boy does fine' can be invaluable for remembering the order of notes, which is an example of a mnemonic device.