### 1.1.85 TempoChangeEvent

A metronome mark or tempo indication.

Event classes: music-event, StreamEvent and tempo-change-event.

Accepted by: Metronome_mark_engraver.

Properties:

> `name` (symbol):

>   `'TempoChangeEvent`

>   Name of this music object.

> `types` (list):

>   `'(general-music event tempo-change-event)`

>   The types of this music object; determines by what engraver this music expression is processed.

#### Internals Reference v2.18.2 (稳定分支).