The method has changed slightly in iOS 6. In order to delete music, you must first turn off iTunes Match. I suggest first turning off Show All Music and then turning off Match. (This seems to speed up the process) Once Match is off, you can delete anything you like.
My feeling is that they did this because for most users, it would cause confusion because music that they listen to is downloaded to a temporary cache, and they didn't want people to be confused between what was downloaded and what was cached.
Like it or not, overall, for most people, Match is much better in iOS 6 than it was in 5. Permanently downloading everything you ever listened to led to a poor user experience.
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That is a question I honestly don't know the answer to, because I don't use Smart Playlists in that way. My suspicion is that yes, you will have to periodically re-download the Smart Playlist. One would hope that you could again just hit the 'download all' button at the bottom of the playlist and it would get everything it didn't already have. I'm quite sure that it will not, however, delete songs that are no longer on that playlist. They should no longer be listed in that particular playlist, but if you were to track them down in their particular album, I bet they would show they were still on the device.
I know that there have been complaints from the beginning about Smart Playlists and Match, and I can see where this would be a very difficult thing to design in such a way that the behavior pleased everyone. If anyone else has experience with this particular setup, I'd be interested in hearing how it behaves.
My feeling is that they did this because for most users, it would cause confusion because music that they listen to is downloaded to a temporary cache, and they didn't want people to be confused between what was downloaded and what was cached.
Like it or not, overall, for most people, Match is much better in iOS 6 than it was in 5. Permanently downloading everything you ever listened to led to a poor user experience.
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Yes but being a recently added smart playlist it updates regularly, does that mean I have to download each time?
That is a question I honestly don't know the answer to, because I don't use Smart Playlists in that way. My suspicion is that yes, you will have to periodically re-download the Smart Playlist. One would hope that you could again just hit the 'download all' button at the bottom of the playlist and it would get everything it didn't already have. I'm quite sure that it will not, however, delete songs that are no longer on that playlist. They should no longer be listed in that particular playlist, but if you were to track them down in their particular album, I bet they would show they were still on the device.
I know that there have been complaints from the beginning about Smart Playlists and Match, and I can see where this would be a very difficult thing to design in such a way that the behavior pleased everyone. If anyone else has experience with this particular setup, I'd be interested in hearing how it behaves.