Represents the collection of elements in the xs:choice section of the play complexType in the MusicXML schema.

A play record has a list of play_type records, each of which join to the play table using foreign key play_id in the play_type table.

play_type is a single-inheritance table, with discriminator column play_type_type.

Disriminator values are:

• ipa
• mute
• semi pitched
• other play