the old days. In the middle of the 20th century, performing choral groups started to emerge and increasingly become popular as time goes by. Aside from churches, universities, schools, and local communities have established choirs. Philippine choral arrangers like Robert Delgado, Fidel Calalang, Lucio San Pedro, Eudenice Palaruan among others have included in the vast repertoires of choirs beautiful arrangements of OPM, folk songs, patriotic songs, novelty songs, love songs, and even foreign songs. The Philippine Madrigal Singers (originally the University of the Philippines Madrigal Singers) is one of the most famous choral groups not only in the Philippines, but also worldwide. Winning international competitions, the group became one of the most formidable choral groups in the country. Other award-winning choral groups are the University of Santo Tomas Singers, the Philippine Meistersingers (Former Adventist University of the Philippines Ambassadors), the U.P. Singing Ambassadors, and the U.P. Concert Chorus, among others. Rock music The United States occupied the Islands from 1898 until 1946 and introduced American blues, folk music, R&B and rock & roll which became popular. In the late 1950s, native performers adapted Tagalog lyrics for North American rock & roll music, resulting in the seminal origins of Philippine rock. The most notable achievement in Philippine rock of the 1960s was the hit song "Killer Joe", which propelled the group, Rocky Fellers, reaching number 16 on the American radio charts. 1970s Up until the 1970s, popular rock musicians wrote and produced songs primarily in English. In the early 1970s, rock music began to be written using local languages, with bands like the Juan Dela Cruz Band being among the first popular bands to do so. Mixing Tagalog and English lyrics within the same song was also popular, an example of which includes the song "Ang Miss Universe Ng Buhay Ko ("The Miss Universe of My Life") by the band Hotdog, who was a primary innovator in the Manila sound scene. The mixing of the two languages (known as "Taglish"), while common in casual speech in the Philippines, was seen as a bold move, but the success of Taglish in popular songs, including Sharon Cuneta's first hit, "Mr. DJ", broke the barrier. Philippine rock musicians' acts were influenced by folk music and other various cultures, helping to lead to the 1978 breakthrough success of Freddie Aguilar. Aguilar's "Anak" ("Child"), his debut recording, is the most commercially successful Filipino recording, and was