Kion's Lament is a song in The Lion Guard: Return of the Roar.
It is sung by Kion as he begins to doubt whether or not he is ready to lead the Lion Guard. The song is later resumed after Mufasa gives him some sagely advice, which leads Kion to believe that he is, in fact, ready to become the Lion Guard's new leader.
An early shipping animatic of the second half of the song, dated 21st January 2015 exists, complete with an early/demo singer. It is almost identical to the final version, save for one notable difference: In the final, Kion walks straight past the water. In the early animatic, he glances down at it.