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tune
/tju?n, t?u?n/
a series of musical notes, especially one that is pleasant and easy to remember
曲调，曲子;旋律
咱们一般觉得某首歌洗脑，某种程度上就是说这首歌的一段旋律非常简略上口。“上口的旋律”用英语就可以表达到catchy tune，非常简略记而且还挺好听的旋律。
例：
It's a very catchy tune (= easy to remember and pleasant).
这是一首很简略上口的曲子。
She was humming a tune as she entered the room.
她边哼着调子边走进了房间。
hum /h?m/ v. 哼（曲子）
out of tune
singing or playing notes that are at 
the wrong pitch (= level) or that do not agree with others being sung or played
唱或弹的音符或音高不正确，或与别人唱或弹的音符纷歧致；走调
The guitar is out of tune.
恐怕这把吉他走调了。
tune (sb/sth) out
to ignore someone or not give your attention to something or to what is happening around you
忽略或人或不把你的留心力放在你周围发生的作业上；不答理，对…置之脑后
Most of what she says is such garbage that I just tune her out.
她讲的尽是
废话，所以我爽性不去答理。
BGMOlivia Dean - Reason To Stay
