I was overwhelmed by the amount of duplicate songs I had in my iTunes library. It would have taken me a lifetime to go through and delete them all. Luckily, I found Tune Sweeper which is excellent!
I firstly downloaded the free demo, to see if the software was worth investing in. I was pleasantly surprised when the sweeper had scanned through my iTunes library in seconds. It returned a list of my duplicate songs, laid out nicely in groups.
At this point, I purchased the software because I wanted to remove the duplicates. Tune Sweeper gives you the option to set a preference of songs to keep, and will delete the rest automatically for you! This is something I couldn't have done using iTunes, and I was able to keep all of my highest quality songs, and deleted my low quality duplicates.
Overall, this software is amazing, and I haven't even explored all of the features yet! (you can download missing artwork for your tracks, fix track information etc..). I would highly recommend Tune Sweeper to anyone who needs to clean up their iTunes library, or make more space on their computer!