If looped playback of the phrase you'll hear it as a song Bashny.Net

If you spend a lot of time on YouTube, you is likely to know. For the first time this phenomenon has been seen in 1995, and in 2008 and 2011, studies have been conducted on this topic. Subjects offered to listen and play some looped phrases. Trying to repeat them, people did not say a word, and sang them.

To create this effect it is necessary that the terms be repeated unchanged. The slightest change would destroy the illusion of music, and you will hear a spoken word.

via factroom.ru