Metronome 
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Metronome</title>
    <style>
        body {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
            font-family: Arial, sans-serif;
        }

        #start {
            padding: 10px 20px;
            font-size: 18px;
        }
    </style>
</head>
<body>
    <button id="start">Start Metronome</button>

    <script>
        let bpm = 45; // Start BPM
        let beatCount = 0;
        let interval;

        function startMetronome() {
            let intervalTime = 60000 / bpm;
            
            interval = setInterval(() => {
                playClick();
                beatCount++;
                
                // Increase BPM after every 64 beats
                if (beatCount % 64 === 0) {
                    bpm += 3;
                    clearInterval(interval);
                    startMetronome(); // Restart metronome with new BPM
                }
            }, intervalTime);
        }

        function playClick() {
            console.log('Click'); // You can replace this with a sound if needed
        }

        document.getElementById('start').addEventListener('click', () => {
            if (!interval) {
                startMetronome();
            }
        });
    </script>
</body>
</html>