This smart playlist will collect every one-star song in your library.

Why didn’t Apple give me a way to delete songs that I don’t like while listening to them on my iPod, and then have those songs automatically delete from my iTunes library next time I sync? By the time I get back to my computer, I’ve totally forgotten which songs I wanted to get rid of.

There’s no automatic way to do this, but you can try this trick (it works with any iPod except the shuffle) to help make deleting songs easier in the future. But first let’s make sure everyone understands the syncing process between your iPod and iTunes: If you use automatic syncing (i.e., you don’t have Manually Manage Music checked in the iPod Summary screen), it’s a one-way sync from your iTunes Library to your iPod. However, there are a few important pieces of info that iTunes pulls from your iPod into your iTunes Library when you sync: purchased songs that don’t already exist in your Library, newly updated play counts, and star ratings. If you manually manage your music, this trick won’t work.

First, use star ratings on your iPod to flag the songs that you don’t like by giving them one star. On the iPod touch and iPhone, click the Track List button to display all the tracks on an album, then click the track you don’t like and drag your finger across the ratings bar to assign one star to the track. On the iPod nano and classic, press the center button twice while the song is playing, which makes the five rating bullets appear, and use the clickwheel to select a rating.

After you sync your iPod to your Mac, you can quickly find all of your one-star songs by sorting your Library by the Rating column. (If you don’t have a Rating column, choose View > View Options and check the Rating box.) Delete a song by selecting it and hitting Delete on your keyboard.

You can also create a smart playlist containing all of your one-star songs. Choose File > New Smart Playlist and create the rule “Rating is 1 star.” Normally when you delete a song from a playlist, iTunes removes the song from the playlist but keeps it in your library. But if you select a track and hold down Option while you press the Delete key, iTunes will delete the song from your library.