Armenia was the first of the 42 countries (Bulgaria withdrew) to reveal its artist:
Srbuk is a finalist of both The X Factor Armenia and The Voice Ukraine, finishing 2nd and 4th, respectively. Other than that, she has released two BOPs so far.
The song was not revealed yet.
Other than that, you can already hear the entries of a few national finals, such as Latvia's and Estonia's. Australia has released a teaser of its NF and you may recognize a few artists!
And now, to the releases from November 16th to November 30th!
Blanche (Belgium 2017) - Moment
Aisel (Azerbaijan 2018) - Don't Make Me Cry
Iveta Mukuchyan (Armenia 2016) - Armenian Girls
(OP's note: this is THE bop)
Alekseev (Belarus 2018) - Как ты там
Sirusho (Armenia 2008) - Pregomesh Remix
Ira Losco (Malta 2002, 2016) - Bad Habits
Dima Bilan (Russia 2006, 2008) - Молния
Ani Lorak (Ukraine 2008) - Сон
Lena (Germany 2010, 2011) - Thank You
Alma (France 2017) - T'es pas un Homme
ela. (from Elaiza - Germany 2014) - Scharade
Vaidas Baumila (Lithuania 2015) - Šalta
Source: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18
Eurovision season has officially started! Have fun!