To help spread the word of the upcoming Horton Hears A Who, 20th Century Fox has teamed up with THX to create a special Horton edition of the THX opening that plays before the majority of films. Scroll down to check it out.

THX stands for Tomlinson Holman’s eXperiment. THX was developed by Tomlinson Holman at Lucasfilm in 1982 to ensure that the soundtrack for the third Star Wars film would be accurately reproduced in theaters.

The THX system is not a recording technology, and it does not specify a sound recording format. THX is mainly a quality assurance system. THX-certified theaters provide a high-quality, predictable playback environment to ensure that any film soundtrack mixed in THX will sound as near as possible to the intentions of the mixing engineer.