After you connect iPod touch/nano/shuffle/classic, iPhone or iPad to your Mac and launch TunesGo (Mac), Click "To iTunes" at the bottom of the window.
And then you can see a new window pops up, telling you that all songs and playlists missing from your iTunes Library will be transferred to your iTunes Library with ratings and play counts. Click "Start" to begin the transferring process.
This is the quickest way to copy music and playlists from your iPhone, iPod touch/nano/shuffle/classic, and iPad to your iTunes Library on Mac. Besides, you can also choose to copy music and playlists to your iTunes Library in the "Music" window. To learn more, read the following infomation.
If you're going to copy some playlists from your iPhone, iPod touch/nano/shuffle/classic, or iPad to iTunes Library, please click "Music" on the left side of the main window. And then you can see playlists on listed from the right side of the popped up window. Right click on the playlist you need and select "Export to iTunes".
Note: Now, you can transfer music and playlists from iPod nano/classic/shuffle/touch to iTunes/Mac without a hitch.