Use ACRCloud (https://www.acrcloud.com) to identify songs from a digital radio station and email you when the same artist plays 3 times in a row.

app.js

/*

Use ACRCloud (https://www.acrcloud.com) to identify songs from a digital radio station and email you when the same artist plays 3 times in a row which could be useful for certain radio competitions (e.g. http://www.heart.co.uk/radio/win-with-hearts-30k-triple-play/). This is just a proof on concept.

npm init -y
npm install --save lodash mailgun-js express body-parser

1) Edit the config as below, you'll need a Mailgun API key for sending emails.
2) Run this app server behind a reverse proxy like NGINX.
3) Setup broadcast monitoring on ACRCloud.
4) After you have added a project to listen to a stream, setup a result callback with a post type of JSON to the URL where your app server is being served.

*/

// Begin - Edit the config
const apiKey = 'key-XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX';
const domain = 'yourdomain.com';
const from = `acrcloud@${domain}`;
const to = 'your@emailaddress.com';
const subject = 'Your Subject Goes Here';
const artist = 'Justin Timberlake';
const smsText = 'PLAY';
const shortCode = '82122';
// End - Edit the config

const _ = require('lodash');
const mailgun = require('mailgun-js')({apiKey, domain});
const express = require('express');
const bodyParser = require('body-parser');
const items = [];
const app = express();
app.use(bodyParser.json());

const sendEmail = () =>
{
    const data =
    {
        from,
        to,
        subject,
        text: `${artist} has played three times in a row! Text ${smsText} to ${shortCode} now for a chance to win. Ignore this email if you don\'t see it straight away.`
    };

    mailgun.messages().send(data, (error, body) =>
    {
        console.log(body);
    });
}

app.post('/', (req, res) =>
{
    if(_.get(req.body, 'data.status.msg') === 'Success')
    {
        const re = new RegExp(artist, 'i');
        const timestamp = new Date(_.get(req.body, 'data.metadata.timestamp_utc'));

        if(timestamp.getHours() >= 10 && timestamp.getHours() <= 15) // between 10am and 4pm
        {
            _.forEach(_.get(req.body, 'data.metadata.music', []), (music) =>
            {
                const artists = [];
                _.forEach(_.get(music, 'artists', []), (artist) =>
                {
                    artists.push(artist.name);
                });

                items.push(
                {
                    title: music.title,
                    artist: artists.join(', '),
                    album: _.get(music, 'album.name'),
                    timestamp: timestamp
                });

                if(items.length > 3)
                {
                    items.shift();
                }
            });

            if(items.length > 2 && re.test(items[items.length-3].artist) && re.test(items[items.length-2].artist) && re.test(items[items.length-1].artist)) // the artist has played 3 times
            {
                sendEmail();
            }
        }
    }

    res.json({status: 'OK'});
});

app.listen(3000);