No, you don't have to count out the measures exactly and other important stuff like:
16 bars ≈ 30 seconds (a chorus)
32 bars ≈ 1 minute (a verse and chorus)
Short song ≈ 1:30 (verse, chorus, bridge, chorus—or something to that effect)
For a young singer, it can be hard to determine if you are a tenor, baritone, or bass, or maybe even sit somewhere between....
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