It’s like Microsoft Word but for music.  MuseScore is great for either writing your own music or it can be used to create piano tracks.  I have used it extensively to turn choir music into practice tracks for each part. For example, I can make an mp3 with the Soprano 2 part playing loud with the rest of the notes in the background. This allows whoever is singing Soprano2 to listen to and learn their part.

While creating a map to show a single location in Google maps is easy, when you want to show many locations on a single map things get more difficult.  Using Google Maps API allow you to show data in a new and interesting way.