Music producers once crammed 30 musicians into a tiny room to make songs sound like a giant orchestra.

In the early 1960s, producer Phil Spector created this famous method at Gold Star Studios in Los Angeles. He would have three pianos and five guitarists all play the exact same melody at the same time. This created a thick, rich sound that filled up every bit of space in the recording.To make it even bigger, Spector sent the sound into a concrete basement called an 'echo chamber.' A speaker played the music in the empty room, and a microphone recorded the echo. This added a natural boom to the music. The final sound was squeezed onto one single track so it would pop out of the small speakers used in old AM radios and jukeboxes.The trick works because of something called the 'Haas Effect.' When our brains hear many similar sounds hitting our ears at almost the same time, we don't hear them as separate instruments. Instead, we perceive them as one single, enormous wall of noise. This made songs like 'Be My Baby' by The Ronettes sound like they were performed by a hundred people.Recording this way was exhausting. Musicians often worked for 12 hours straight in a room meant for only 10 people. This style changed music forever and inspired famous albums like Bruce Springsteen's 'Born to Run.'