Aglet
'Aglet' is a ballad performed in the 3rd episode of the second season, "Tip of the Day" which originally premiered on May 8, 2009. In the beginning of the episode, the family is seen stumped on a crossword puzzle clue to find the word 'aglet'. This inspires Phineas and Ferb to host a concert and perform a song that brings awareness to what the tip of a shoelace is called. Even though it's a miniscule piece of information, it shows that kids should feel comfortable sharing their discoveries with others, no matter how important or uninmportant someone else might think it is.