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Being a Sweet Dreams Fuel incarnate, expect to see many happy and cute songs although it does not always mean that sad or epic songs can also be played.
"Sakura's Theme II" definitely belongs here, as not only is it an awesome song, it also plays during almost every action scene in the first two seasons in addition to every next episode teaser.
By the third season, it gets replaced with the equally cool "Card wo Tsugumono" (yes, it deserves a spoiler).
The third season opening theme, "Platinum", is also worthy of mention, along with the awesome orchestral arrangement in "Hontou no Ichiban". Played when Syaoran comforted a crying Sakura after Yukito politely turn down her confession