Background: Frederick II (26 December 1194 - 13 December 1250; Sicilian: Fidiricu, Italian: Federico, German: Friedrich) was King of Sicily from 1198, King of Germany from 1212, King of Italy and Holy Roman Emperor from 1220 and King of Jerusalem from 1225. His mother Constance was Queen of Sicily and his father was Henry VI of the Hohenstaufen dynasty. Frederick's reign saw the Holy Roman Empire reaching its all time territorial peak.
Context: Historians rate Frederick II as a highly significant European monarch of the Middle Ages. This reputation was present even in Frederick's era. Lansing and English, two British historians, argue that medieval Palermo has been overlooked in favor of Paris and London: One effect of this approach has been to privilege historical winners, [and] aspects of medieval Europe that became important in later centuries, above all the nation state.... Arguably the liveliest cultural innovation in the 13th century was Mediterranean, centered on Frederick II's polyglot court and administration in Palermo.... Sicily and the Italian South in later centuries suffered a long slide into overtaxed poverty and marginality. Textbook narratives therefore focus not on medieval Palermo, with its Muslim and Jewish bureaucracies and Arabic-speaking monarch, but on the historical winners, Paris and London. Modern medievalists no longer accept the notion, sponsored by the popes, of Frederick as an anti-Christian. They argue that Frederick understood himself as a Christian monarch in the sense of a Byzantine emperor, thus as God's "viceroy" on earth. Whatever his personal feelings toward religion, certainly submission to the pope did not enter into the matter in the slightest. This was in line with the Hohenstaufen Kaiser-Idee, the ideology claiming the Holy Roman Emperor to be the legitimate successor to the Roman Emperors. 20th century treatments of Frederick vary from the sober (Wolfgang Sturner) to the dramatic (Ernst Kantorowicz). However, all agree on Frederick II's significance as Holy Roman Emperor. In the judgment of British historian Geoffrey Barraclough, Frederick's extensive concessions to German princes--which he made in the hopes of securing his base for his Italian projects--undid the political power of his predecessors and postponed German unity for centuries. However, the modern approach to Frederick II tends to be focused on the continuity between Frederick and his predecessors as Kings of Sicily and Holy Roman Emperors, and the similarities between him and other thirteenth-century monarchs. David Abulafia, in a biography subtitled "A Medieval Emperor," argues that Frederick's reputation as an enlightened figure ahead of his time is undeserved, and that Frederick was mostly a conventionally Christian monarch who sought to rule in a conventional medieval manner.
Question: What were some of the concessions he gave to German princes?
Answer: undid the political power of his predecessors and postponed German unity for centuries.

Background: C+C Music Factory is an American musical group formed in 1989 by David Cole and Robert Clivilles. The group is best known for their five hit singles: "Gonna Make You Sweat (Everybody Dance Now)",
Context: In 1991, as Clivilles + Cole, the duo released an LP-single A-side featuring a cover of U2's "Pride (In the Name of Love)", but it was the B-side "Deeper Love", featuring vocals by Deborah Cooper (a long time Clivilles and Cole vocalist) and Paul Pesco that proved to be a hit, peaking at No. 15 in the UK. Deborah Cooper performed "Deeper Love" on Saturday Night Live with C+C Music Factory. It was also covered by Aretha Franklin with production by Clivilles + Cole. Both sides charted on the Billboard Hot 100 in the spring of 1992: "A Deeper Love" peaked at #44, while "Pride (In The Name Of Love)" reached #54. In 1992 as Clivilles + Cole an album was released called Greatest Remixes Vol. 1 featuring remixes by the duo of their own songs along with other artists' songs. The video for these songs was actually one long featurette, beginning with "Deeper Love" and then continuing into "Pride (In The Name Of Love)" halfway through the video. The video was labelled "Pride (A Deeper Love)". Some networks preferred to show the videos separately while others played the whole length. In 1992, the duo assembled The S.O.U.L. S.Y.S.T.E.M., only one song of this group was ever released. A special uptempo vocal club remix was released as a promo single by Arista Records. Clivilles and Cole later released a new single under the moniker The 28th Street Crew called O in 1994. In 1994 Clivilles and Cole produced a song for El General "Las Chicas", which borrowed heavily from the song "Boriqua Anthem" on the Anything Goes! album. Since then, Robert Clivilles has produced on his own including the membership of the group MVP as well as one last album release in 1996 on Columbia under the moniker Robi Rob's Club World and various other releases under different names.
Question: What time era was one of their releases in?
Answer:
In 1994 Clivilles and Cole produced a song for El General "Las Chicas",