Restore Shazam from 1.8 to 1.7 (or any other app too)
I normally read reviews before I do an update. I'm always concerned that a newer version will damage, delete or drastically change the app with the update. Unfortunately, I assumed this was simply an OS 3+ update and not a revamp of the whole app.
I wasn't exactly sure if there would be a 5 song limit imposed with the 1.8 update, so I found a way to restore the app to an older version I had backed up on iTunes. (do not delete new app/install, the restore will replace it for you)
Check your applications folder to make sure the app is there. If you don't, it's already too late. If you still do, right-click on app, select (get info) and ensure it's the older version. Then move on to next step.
First,(Windows inst.) select edit, preferences, click the devices tab, then select disable automatic syncing for iPhones and iPods.
Secondly, connect your iPhone, when iTune displays it, then select the applications tab. Make sure Shazam is selected (or just sync all) then select sync.
When the restore is complete you should have the older version reinstalled. Make sure to enable automatic syncing for iPhones and iPods after you're done and create a new backup in case you have newer apps you'd like to keep.
good luck!