ɪɾ ɪnˈɪʃəli bɹˈɔːdkæst ɐn ˌɪnstɹəmˈɛntəl mjˈuːzɪk fˈɔːɹmæt ˌʌndɚ ðə nˈeɪm mjˈuːzɪkə fˈɛlɪz nˈaɪnti nˈaɪn bᵻfˌoːɹ tʃˈeɪndʒɪŋ tʊ ɐ hˈɪt ɹˈeɪdɪˌoʊ fˈɔːɹmæt æz sənˈiːdoʊ nˈaɪnti nˈaɪn baɪ ðɪ ˈɛnd ʌvðə dˈɛkeɪd.
It initially broadcast an instrumental music format under the name Música Feliz 99 before changing to a hit radio format as Sonido 99 by the end of the decade.