A familiar song

song.py

import time, sys, base64
for i, v in enumerate((getattr, time, sys, "sleep", 
                        "decode", "bytes", "stdout", 
                        "write", "flush", 1.0, 6, 
                        base64, "upper", 1000.0, "'",
                        print, 0), start=3):
    vars()['_'*i] = v
_ = (
    b'RGFpc3kgRGFpc3kgZ2l2ZSBtZSB5b3VyIGFuc3dlciBk'
    b'bwpJJ20gaGFsZiBjcmF6eSBhbGwgZm9y\nIHRoZSBsb3'
    b'ZlIG9mIHlvdQpJdCB3b24ndCBiZSBhIHN0eWxpc2ggbWF'
    b'ycmlhZ2UKSSBjYW4ndCBh\nZmZvcmQgYSBjYXJyaWFnZQ'
    b'pCdXQgeW91J2xsIGxvb2sgc3dlZXQgdXBvbiB0aGUgc2V'
    b'hdApPZiBh\nIGJpY3ljbGUgYnVpbHQgZm9yIHR3bw=='
)
OOo,OoO,ooO,Ooo,oOo,OOO,ooo,oo = ___(
    ____,______),____________/_____________,___(___(
    ______________,_______+________)(_),_______)(
    ),___________________,_________________,(
    ____________ + _____________/________________
    ),__________________,__________________
O = lambda _: ___(___(_____,_________),__________)(
    ___(_,_______________)()) and ___(___(_____,
    _________),___________)()
for o in ooO:
    O(o) or OOo((OoO, Ooo)[o==oOo])
    OoO *= OOO
oo() or ooo()