This is the 3843rd most frequent Turkish word.
şarkıyı
The Turkish word "şarkıyı" means "the song" (in the accusative case).
In this sentence, 'şarkıyı' is the direct object of the verb 'öğrendik' (learned). It is in the accusative case which is used when the noun is a definite object.
Öğrencilerle birlikte yeni bir şarkıyı öğrendik.
We learned a new song together with the students.
Here, 'şarkıyı' again serves as the direct object of the verb 'söylediler' (sang), and the accusative case shows that it is a specific song.
Şarkıyı çok duygusal bir şekilde söylediler.
They sang the song in a very emotional manner.
The word 'şarkıyı' in this context is the object of the action 'çalmaya başladı' (started to play), demonstrating its role as the specific entity being played on the guitar.