dfcreative/piano-key

# Piano-key [![Build Status](https://travis-ci.org/dfcreative/piano-key.svg?branch=master)](https://travis-ci.org/dfcreative/piano-key) [![Code Climate](https://codeclimate.com/github/dfcreative/piano-key/badges/gpa.svg)](https://codeclimate.com/github/dfcreative/piano-key) [![unstable](http://badges.github.io/stability-badges/dist/stable.svg)](http://github.com/badges/stability-badges)

Tools for working with [piano keys and frequencies](http://en.wikipedia.org/wiki/Piano_key_frequencies).

[![npm install piano-key](https://nodei.co/npm/piano-key.png?mini=true)](https://nodei.co/npm/piano-key/)


```js
var key = require('piano-key');

key.getName(49);                //A4
key.getFrequency(49);            //440
key.getFrequency('A4');            //440
key.getNumber('A4');            //49
key.getNumber(440);                //49
key.getOctave(49);                //4
key.getNote(50);                //A#
key.getNote('A#4');                //A#

key.isBlack(49);                //false
key.isBlack(48);                //true
```