"Stereo Hearts" is a song by American group Gym Class Heroes featuring Adam Levine, lead singer of band Maroon 5. The song was first released on June 14, 2011 through A&M/Octone Records, Fueled by Ramen, Decaydance and Warner Bros. Records. as the lead single from the group's fifth studio album, The Papercut Chronicles II (2011).

"Stereo Hearts", produced by Benny Blanco and RoboPop begins with Maroon 5's Adam Levine singing the hook: "My heart's a stereo / It beats for you, so listen close/ Hear my thoughts in every note. / Make me your radio / Turn me up when you feel low / This melody was meant for you / So sing along to my stereo." McCoy then raps about serenading his ideal girl and picking love over animosity, all the while relaying the message using music-based metaphors. Additional Fender Rhodes was played by Austin Bisnow at Chalice Recording Studios in Los Angeles, CA.

Gym Class Heroes drummer Matt McGinley explained that the song's music video "basically plays on the idea that we're sort of just being casual, hanging out, being ourselves and our shadows get wild and get loose. The video shows the band playing in the city of New York and their shadows are playing on the ground. In the video, Levine appears on a TV screen inside a pawn shop."

The term stereophonic sound or, more commonly, stereo, refers to any method of sound reproduction in which an attempt is made to create an illusion of directionality and audible perspective. This is usually achieved by using two or more independent audio channels through a configuration of two or more loudspeakers in such a way as to create the impression of sound heard from various directions, as in natural hearing. Thus the term "stereophonic" applies to so-called "quadraphonic" and "surround-sound" systems as well as the more common 2-channel, 2-speaker systems. It is often contrasted with monophonic, or "mono" sound, where audio is in the form of one channel, often centered in the sound field (analogous to a visual field). Stereo sound is now common in entertainment systems such as broadcast radio and TV, recorded music and the cinema.

The word stereophonic derives from the Greek "στερεός" (stereos), "firm, solid" + "φωνή" (phōnē), "sound, tone, voice" and it was coined in 1927 by Western Electric, by analogy with the word "stereoscopic".

Adam Noah Levine (born March 18, 1979) is an American singer-songwriter and musician, best known as the front man and guitarist for the pop rock band Maroon 5. He is also a coach on the American talent show The Voice.

Levine was born in Los Angeles to Fred and Patsy (née Noah) Levine. His uncle is journalist and author Timothy Noah. He has a brother, Michael, and a sister, Julia. When he was six years old, he made the winning shot of his local YMCA championship basketball game (on a team his father coached) with no time left on the clock. He has said that the incident changed his life and gave him the confidence to be successful.

Levine attended French Woods Festival of the Performing Arts Camp (Hancock, NY) with best friend Jesse Carmichael, guitar player of the band known at that time as Kara's Flowers. He graduated from Brentwood School in 1997.

Levine has Jewish ancestry on both sides of his family (his father and maternal grandfather were Jewish), and considers himself Jewish, though according to The Jewish Chronicle, who interviewed Levine, he "has rejected formal religious practice for a more generalized, spiritual way of life". He chose not to have a Bar Mitzvah as a child.

Megan and Liz (commonly stylized as Megan & Liz) are American pop girl band composed of fraternal twin sisters, Megan and Liz Mace, from Edwardsburg, Michigan. They are both songwriters, and Megan is their guitarist.

Megan McKinley Mace and Elizabeth Morgan Mace were born on November 21, 1992 in Edwardsburg, Michigan. Megan is the older twin.^{[citation needed]}

Their first video on YouTube, entitled "This Note", is a song which they wrote aged 15. Their first cover was of "Ain't No Mountain High Enough", originally written by Nickolas Ashford & Valerie Simpson and performed by Marvin Gaye and Tammi Terrell, but better known from Diana Ross's cover in 1970. They have posted 22 original songs on YouTube (as of March 2012).

Their YouTube channel currently has over 676,000 subscribers and over 139 million video views. They are the 34th most subscribed music channel on YouTube.

The duo released their first official music video on May 20, 2011 of their self-written song "Happy Never After." Since then they have posted 5 original and official videos. Two days later, on May 22, 2011, Megan and Liz performed at the Totally Tube concert in Westbury, New York, alongside fellow YouTubers Kurt Schneider, Tiffany Alvord, Joseph Vincent, Kait Weston, and Jenna Rose.