It was a eurobeat/techno remix of Dang Ni Gu Dan by Nicholas Teo

Oh, lemon, you are my lemon,
Ay, where do you grow in my garden?
Oh, lemon, you are my lemon,

output_pbm(int *image[HEIGHT][WIDTH]){
    FILE *output_file = fopen("out.pbm", "wb");

    // Add header.
    fprintf(output_file, "P4\n%i %i\n", WIDTH, HEIGHT);

    int i, j;
    for (i = 0; i < HEIGHT; i++) {
        for (j = 0; j < WIDTH; j++) {
            fputc(image[i][j], output_file);
        }
    }
    fclose(output_file);
}