Every now and then you'll discover a couple or few smaller apps that work well together, or alongside each other. The type of situation where you get the 2+2=5 effect. Individually both apps are great, but when used together they becomes something even more. "Two great tastes that taste great together," to borrow an old marketing phrase.

That's been the case for me with two iPhone apps - Shazam (iTunes store page) and Pandora (iTunes store page). Today I use them alongside each other. It's my hope that someday they will be able to communicate with each other and share information.

I've written about Pandora here before. It's a web app that happens to have an iPhone client as well, where you can start with music you like and it helps you find more music that fits your taste and style. You create channels, or stations, and the Pandora service selects similar music for your to hear, and you can fine tune as you go.

Shazam is another of those magical "wow" apps for the iPhone. I use it in the car when I hear a song I like. Rarely do I know the name of the song, or even the artist. But as it plays, I just tell Shazam to listen to a 12-second portion of the song (a process called "tagging"). It uploads the resulting data to the centralized service, and back comes all the information about the song - Artist, title, album, everything. It's really amazing, and in my experience 100% accurate. From there you can also find YouTube videos and launch into the iTunes store to buy the music you've tagged.

I'll often take the name of an artist I discover from Shazam and plug the info into Pandora and start listening there. It's a great way to quickly and relatively effortlessly drill down into new music I have never heard before, but it's music that I really like.

Now imagine if you could use Shazam to identify a song and then inside Shazam choose an option to create a channel based on that artist in Pandora. That would be awesome, truly awesome. I have no idea how "possible" it is, but I can hope. :)

On a similar note - meaning various apps that work great together - ReadWriteWeb published an article this past week with a list of apps that complement each other well (including my Shazam/Pandora combination).