Simply click on a character name and on a theme from Undertale, and will play the theme of that character in the position of who ever's theme you chose. A sprite will also be shown. Click the dice in the corner to get a random theme, across from it is what the theme may or may not be called. Click the top next button to switch characters and the bottom to switch themes. Click the top arrow to replay the theme Question mark button? I'm not certain
There are 182 themes on this, so I will not link them all here, but I will point you in the right direction. Ethan harper and Le fun shark's themes are a lot of the themes used here.Ethan harper's sprites are used plentifully here as well. https://www.youtube.com/watch?v=NUO72GhvCPs&list=PLy9vKC6LGeuBd7_ZGamsOlq2QCPq_TpGK&index=1 is my playlist with many of the used themes. Some of them you won't be able to find, like gaster spear of justice, which is literally just Gaster's theme and spear of justice being played at the same time with different speeds, and both muffet and asgore's hopes and dreams are just their theme in a major key Also none of the sprites are mine, though they were all edited in some way, and no theme is more then a minute long, so if you find one you really like that gets cut off, comment it below and I will find the link.(though being perfectly honest, you could probably find the theme by typing in the character's name and then the song or using the provided name when you search). Finally, the theme names I use are not always the same as what the original are called. Characters: Napstablook Toriel Sans Papyrus Undyne Alphys Mettaton Muffet Asgore Asriel Chara Gaster Temmie