So far only two Tamagotchis are known to have one of these charms are Lovelitchi and Melodytchi. Melodytchi keeps her charm around her neck, and Lovelitchi keeps her charm in her heart bag.
A Melody Charm works when shaken, touched or tapped. Through these three actions, the Melody Charm gives off a twinkly beep or a shoe tapping sound.
The Melody Charm gives off shiny pink sparkles every time one of these actions are done. The sparks also seem to make anyone happy near the charm(s), similar to Hapihapitchi's happy power. Also with tone deaf singers like Mametchi, the charm somehow seems to make his voice sound good whenever he is wearing it or using it. Without the charm, he is a horrible singer. The reason on how the charm does this is unknown.
Lovelitchi and Melodytchi haven't been seen using the charms much in the anime, Tamagotchi!, and have never been seen singing while using the charm either.
Lovelitchi and Melodytchi earned these charms after they performed their song Happy Happy Harmony in front of Joou Sama, at the Melody Land Festival. Everyone was so happy, they cheered, screamed, and clapped, and so did Joou Sama after they finished. Joou Sama thanked Lovelitchi and Melodytchi and told Melodytchi the truth about her Melody Violin. After she told the truth to Melodytchi, the Melody Note and Crown on the ceiling with the Melody Angels started to glow. Then with a glowing burst, two little hearts floated down and landed in Lovelitchi's and Melodytchi's hands. Then suddenly stop glowing to reveal that they were Melody Charms. Joou Sama explained that the Melody Charms were created by Shodai Joou Sama, and that one day she wanted the charms to be given to the two greatest musicians in Melody Land.
A replica toy of the charm has also been made by Bandai Japan, selling price is about ¥2,835. This Tamagotchi-themed toy plays five different songs when tapped and shaken. It plays two music sounds by default, but another mode lets you choose 5 other sounds: piano, flute, trumpet, drum, and dog. There are also two different minigames and a free play mode. Requires 2 AAA-size batteries (batteries included).