While most people usually use Google's Keyword Tool (here are some tips), here are 3 additional tools that you can try. Best of all, they're all either totally or partly free.
While KeywordEye comes from a UK developer and as a result uses British defaults, it doesn't take much to make it more US oriented. In fact, it can give you keywords for several countries and languages if that's needed.
One of the coolest things is that it offers a cloud visualization of the most used keywords (see the graphic on the left). Keep in mind that the free version limits you to 100 keyword searches, which is normally plenty for most music campaigns.
Keyword Spy approaches keyword search a little differently than most, allowing you to search a domain for keywords. That means you can look at a competitor's site to easily determine what they're using. There's an "Ads" page that shows you some information about the adverts used on a site, and a "Top List" page provides a list of the most successful keywords.
This tool is really a paid tool that has a useful free option that has the unique ability to provide a metric for the number of Google results. This shows you how big the field or the competition is, as well as a useful section on related keywords.
If you're really serious about keywords and don't mind spending some money, paid services like SpyFu, Wordtracker, Adgooroo, Complete.com, and KeywordDiscovery are all viable options as well.
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