这首曲子是大调。

This piece is in a major key.

Source: Tatoeba

Sentence Composition

=1 这 zhè
  1. (pronoun) this; these
  2. (bound form) this; the (followed by a noun)
  3. (bound form) this; these (followed by a classifier) (in this sense, commonly pr. zhèi, esp. in Beijing)
=1 这 zhèi (coll.) this
2 首 shǒu
  1. head
  2. chief
  3. first (occasion, thing etc)
  4. classifier for poems, songs etc
3 曲子 qǔzi
  1. poem for singing
  2. tune
  3. music

classifier: 支
=4 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=4 是 shì variant of 是 shì
5 大调 dàdiào (music) major key