QR codes, or quick response codes, is a type of 2D bar code that may be decoded using your smartphone with a QR code reader.  QR codes unite the printed and digital world without having to type or remember any links.
From being a tracking mechanism for auto parts, QR codes have proven to be very useful in marketing and convenience related applications that is more suitable for smartphone users.  QR codes show up on marketing materials such as movie posters, promotional posters for various products, billboards, flyers, among other things.  These have also been seen on newspaper ads, business cards, artwork, and other everyday things.

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QR Code Requirements

1. A mobile phone with a camera and Internet connectivity
2. A QR code reader (any QR reader will do)
3. A landing page.

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QR Music Campaigns

QR Music Campaigns offer the perfect social networking tool for your clients. Stream the sound of your brand by directing your customers to your own custom webradio. QR codes

Increase traffic to your site or facebook page and allow your clients to go “viral with your brand” by sharing your page online and taking the music experience home.
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Popular Uses for QR Codes:

1. QR Codes on printed materials. QR code can lead people to your Twitter, Facebook, LinkedIn, YouTube, Flickr, Plaxo, Yelp, FourSqure, Digg, Delicious, StumbleUpon, Whrrl, and MySpace profiles, etc.
2. Scavenger hunts. Scavenger hunts are fun and engaging, although a lot easier to write about than to administer. Still, for destination marketing, a scavenger hunt approach can be a great way to get visitors to check out places they might not otherwise go.
3. Labeling. Somewhere, a restaurant patron is enjoying wine from your vineyard. They notice the QR code on the bottle and quickly scan it. That takes them to a mobile site where they can learn more about your wine, your vineyard, and links to where you can buy a case for delivery…all before the check comes.
4. Storefront displays. Few retail businesses are open 24/7. Don’t (fully) disappoint potential customers after you’ve left for the day. Create a Shop Online Now! QR code and put it in your storefront window. One quick scan and you’ve turned a potential lost sale into an online customer who’s going to share a lot more of their contact information with you.
5. Promotions, discounts and giveaways. You could run these codes in advertisements or post them throughout your store. You could even turn them into a “retweet” so that your shoppers share their discount with their followers.
6. Laptop stickers. Slap a QR sticker of your vCard or website to your laptop, making it easier for other geeks to connect with you when you’re at the local coffee shop.
7. T-shirts. For more engagement from the crowd, put different messages on the shirts, so people take more scans of more of your codes.
8. Use QR codes to get Likes and Follows. You can create mobile-friendly landing pages with Facebook like buttons or lead them to your Twitter page for a quick follow. The name of the game is engagement, so a like or follow can create a long-term marketing opportunity.
9. Supplement your retail space. QR codes next to pieces of art could help art galleries move more art, or museums replace those aging audio tape tours. Hardware stores could link to how-to videos on YouTube of how to use specific power tools. Groceries could link to pages that talk about how their products were sourced, and perhaps to interviews of the farmers who grew the food. Electronic shops could bring visitors to review sites so they could get unbiased reviews of stocked products. Or to an e-commerce site where shoppers could buy out-of-stock items. Book stores could link to their own reviews of books on their blog.
10. Increase e-commerce sales. Since QR codes can lead to URLs, you can create a code that will populate a shopping cart with specific products.
11. Build your email subscriber list. Use your QR code to send people to your email signup.