# Detect
[](https://www.npmjs.com/package/tonal-detect)
Find chord and scale names from a collection of notes or pitch classes
This is part of [tonal](https://www.npmjs.com/package/tonal) music theory library.
**Example**
```js
import { chord } from "tonal-detect"
chord(["C", "E", "G", "A"]) // => ["CM6", "Am7"]
```
**Example**
```js
const Detect = require("tonal-detect")
Detect.chord(["C", "E", "G", "A"]) // => ["CM6", "Am7"]
```
* [Detect](#module_Detect)
* [`.chord(notes)`](#module_Detect.chord) ⇒ Array.<String>
* [`.scale(notes)`](#module_Detect.scale) ⇒ Array.<String>
## `Detect.chord(notes)` ⇒ Array.<String>
Given a collection of notes or pitch classes, try to find the chord name
**Kind**: static method of [Detect](#module_Detect)
**Returns**: Array.<String> - chord names or empty array
| Param | Type |
| --- | --- |
| notes | Array.<String> |
**Example**
```js
Detect.chord(["C", "E", "G", "A"]) // => ["CM6", "Am7"]
```
## `Detect.scale(notes)` ⇒ Array.<String>
Given a collection of notes or pitch classes, try to find the scale names
**Kind**: static method of [Detect](#module_Detect)
**Returns**: Array.<String> - scale names or empty array
| Param | Type |
| --- | --- |
| notes | Array.<String> |
**Example**
```js
Detect.scale(["f3", "a", "c5", "e2", "d", "g2", "b6"]) // => [
"C major",
"D dorian",
"E phrygian",
"F lydian",
"G mixolydian",
"A aeolian",
"B locrian"
]
```