2.19.56 Learning Manual correction.

[Knute Snortum]

3.3.2 Creating contexts

In an input file a score block, introduced with a \score command, contains
a single music expression and an associated output definition (either a
\layout or a \midi block).
I'm thinking the last part of the sentence should be "(either a \layout or
a \midi block or both)."

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Knute Snortum
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