Description Thing Will Sing . Thing the monster just wants to sing. But does anyone want to listen? King Biff and the Gong . King Biff smells wrong. It is time for a bath, but King Biff does not want to play along. The phonemes /th/ng/ are featured in this title. In Level 3 - Yellow books, children build on the letter-sound combinations learned in levels 1 and 2. They learn consonant digraphs (sounds made up of two letters together such as 'ch' or "ll") and long vowel sounds (such as 'igh' or 'ai').