A pulsar (portmanteau of pulsating star) is a highly magnetized, rotating neutron star that emits a beam of electromagnetic radiation. This radiation can only be observed when the beam of emission is pointing towards the Earth, much the way a lighthouse can only be seen when the light is pointed in the direction of an observer, and is responsible for the pulsed appearance of emission. Neutron stars are very dense, and have short, regular rotational periods. This produces a very precise interval, between pulses that range from roughly milliseconds to seconds for an individual pulsar.

The precise periods of pulsars makes them useful tools. Observations of a pulsar in a binary neutron star system were used to indirectly confirm the existence of gravitational radiation. The first extrasolar planets were discovered around a pulsar, PSR B1257+12. Certain types of pulsars rival atomic clocks in their accuracy in keeping time.

Gustavo Cerati (Born Gustavo Adrián Cerati Clark on August 11, 1959), is a singer-songwriter, composer, and rock producer. He is primarily known as the lead singer, songwriter, and guitarist of Soda Stereo (1982–1997), considered by many to be one of the most important and influential bands of Latin Rock. His work inside and outside of Soda Stereo makes him one of the most recognizable figures in Ibero-American rock. His solo career began in the early 1990s when on hiatus from Soda Stereo Cerati recorded his first solo album Amor Amarillo (Yellow Love).

Cerati has experimented with various musical genres, including electronic music (Plan V) and symphonic music. Throughout his career Cerati has been nominated for various Grammy, MTV, and Gardel awards. In 2007, Cerati reunited with Soda Stereo for a reunion tour Me Veras Volver Tour. On the 15th of May 2010 Cerati suffered a cerebral stroke after a show in Venezuela. Since then he remains in a coma under respiratory aide.

Cerati was born on the 11th of August 1959 in Buenos Aires, Argentina. He was the oldest son of the engineer and accountant Juan José Cerati, and Lilian Clark. From an early age Cerati showed an interest in music. His first incursion into music was a broomstick band that he formed in elementary school. Besides music, Cerati enjoyed drawing. He would spend long hours drawing superheroes such as “Superbrain" (similar to Superman, minus the predilection to kryptonite). He was an able athlete who practiced swimming and athletics. He won second place in a competition for the Billiken magazine after running 100 meters in an intercollegiate competition. One of Cerati’s main activities during his youth was directing the choir for the College, where he was suspended for burping during mass (he was later pardoned after winning a singing competition). As a teenager he worked as a medical assistant at the Boehringer laboratory in Argentina in 1981. A few years later he served in the Argentinian military.

Armin van Buuren (Dutch pronunciation: [ˈɑr.mɪn vɑn ˈby.rə(n)]), OON (born 25 December 1976 in Leiden, Netherlands) is a Dutch trance producer and DJ. Between 2007 and 2010, he was voted number one in DJ Magazine's annual top 100 list of the most popular DJs. In the 2011 list, he ranked in second place. Since 2001, Van Buuren has hosted a weekly radio show called A State of Trance, which claims to have around 15 million weekly listeners in 26 countries, which would make it one of the most listened-to radio shows in the world. His 2008 studio album, Imagine, entered the Dutch album chart at #1, a first for a dance music artist in Dutch music history.

Armin van Buuren was born in Leiden, Netherlands on 25 December 1976, but grew up in Koudekerk aan den Rijn. Van Buuren started making music when he was 14.^{[citation needed]} He was inspired by French electronic music composer, Jean Michel Jarre, and wished to become a great electronic music composer like Jarre.^{[citation needed]}

He finished high school at the Stedelijk Gymnasium Leiden in 1995, and left for college to study law at Leiden University. While studying law, Van Buuren's interest for making music blossomed, and he began working as a DJ in a local club called Nexus. As his musical career began to take off, he put his law degree on hold, although he did return to finish law school in 2003.