In classical Greek iconography Paris, a Trojan, is represented as non-Greek by his Phrygian cap, which was also worn by Mithras and survived into modern imagery as the "Liberty cap" of the American and French revolutionaries. Phrygians spoke the Phrygian language, a member of the Indo-European linguistic family.
Welsh is an official language in Wales and Irish is an official language of Ireland and of the European Union. Welsh is the only Celtic language not classified as endangered by UNESCO. The Cornish and Manx languages went extinct in modern times. They have been the object of revivals and now each has several hundred second-language speakers.
The Indo-Aryans were united by shared cultural norms and language, referred to as aryā 'noble'. Over the last four millennia, the Indo-Aryan culture has evolved particularly inside India itself, but its origins are in the conflation of values and heritage of the Indo-Aryan and indigenous people groups of India. 
Armenian music is a mix of indigenous folk music, perhaps best-represented by Djivan Gasparyan's well-known duduk music, as well as light pop, and extensive Christian music. Instruments like the duduk, the dhol, the zurna and the kanun are commonly found in Armenian folk music.
That could imply that they are descended from a common ancestor, Proto-Italo-Celtic, which can be partly reconstructed by the comparative method. Scholars who believe that Proto-Italo-Celtic was an identifiable historical language estimate that it was spoken in the 3rd or 2nd millennium BCE somewhere in South-Central Europe.
The language-shift from Middle Iranian to Turkic and New Persian was predominantly the result of an "elite dominance" process. Moreover, various Turkic-speaking ethnic groups of the Iranian Plateau are often conversant also in an Iranian language and embrace Iranian culture to the extent that the term Turko-Iranian would be applied.
Historical. Hittite; Indo-Aryan. Vedic. Hinduism; Buddhism; Jainism; Sikhism; Iranian. Persian. Zoroastrianism; Kurdish. Yazidism; Yarsanism; Scythian. Ossetian ...