The House of Music, or Haus der Musik, rates among the best museums in the city. Spread over four floors, it helps explain sound in an amusing and interactive way, accessible to both children and adults.
The first floor houses special changing exhibitions, as well as the Vienna Philharmonic's historical archives, where a shortened version of the world famous New Year's concert can be heard and you can compose your own waltz with the interactive roll of a die. The second floor's "prenatal listening room" re-creates noises heard by babies in the womb. Haydn, Mozart, Beethoven, Schubert, Strauss, and Mahler each have a room on the third level, and yet another floor deals with experimental and electronic music. Displays are very interactive.
If you want a break while exploring, head on to the self-catering Café Nicolai on the entrance level.
Tram 1 & 2 will take you there, as will bus 3A.