let totalComparisons;

function initializeSorter() {
    // ... (existing code)
    
    totalComparisons = (filteredSongs.length * (filteredSongs.length - 1)) / 2;
    updateProgress();
}

function chooseSong(choice) {
    history.push({
        pair: [filteredSongs[0], filteredSongs[1]],
        choice: choice,
        loserIndex: 1 - choice
    });
    rankings[filteredSongs[choice]]++;
    let loser = filteredSongs.splice(1 - choice, 1)[0];
    if (filteredSongs.length > 1) {
        filteredSongs.splice(Math.floor(Math.random() * (filteredSongs.length - 1) + 1), 0, loser);
    } else {
        filteredSongs.push(loser);
    }
    updateProgress();
    displayNextPair();
}

function updateProgress() {
    const completedComparisons = totalComparisons - (filteredSongs.length * (filteredSongs.length - 1)) / 2;
    const progress = Math.round((completedComparisons / totalComparisons) * 100);
    document.getElementById('progress').textContent = `Progress: ${progress}%`;
}