Print a Singing Angel

JS (ES6), 328 330 bytes

a=(b,c)=>b.repeat(c);f=prompt().split(" ");if(f[1].length<5)f[1]+=" ";console.log(a(" ",18)+a("_",12)+`
(\\   ___   /)    /`+a(" ",12)+`\\
( \\ (‘o‘) / )   /    `+f[0]+`    \\
(`+a(" ",11)+`)  <     `+f[1]+a(" ",21)+`
 (  ‘> <’  )    \\`+a(" ",14)+`/
    /    \\       \\`+a("_",12)+`/
   /      \\  
  ‘ – “ - ‘`)

• 1 helper function (a gets charcode (one char shorter) and repeats c times)
• 1 variable for getting input via prompt() and doing a split to array
• arguably abuses the special cases there but still does the job
• I assumed the extra 21 spaces in the middle column were needed

a=(b,c)=>b.repeat(c);f=prompt().split(" ");if(f[1].length<5)f[1]+=" ";console.log(a(" ",18)+a("_",12)+`
(\\   ___   /)    /`+a(" ",12)+`\\
( \\ (‘o‘) / )   /    `+f[0]+`    \\
(`+a(" ",11)+`)  <     `+f[1]+a(" ",21)+`
 (  ‘> <’  )    \\`+a(" ",14)+`/
    /    \\       \\`+a("_",12)+`/
   /      \\  
  ‘ – “ - ‘`)

Python 3.5, 207 chars, 226 bytes

def f(s):a,b=s.split();u='_'*12;[print(' '*int(x)if x.isdigit()else x,end='')for x in"99"+u+"\n(\\3___3/)4/66\\\n( \\ (‘o‘) / )3/4"+a+"4\\\n(92)2<5"+b+"\n (2‘> <’2)4\\95/\n4/4\\7\\"+u+"/\n3/6\\\n2‘ – “ - ‘"]

Output:

                  ____________
(\   ___   /)    /            \
( \ (‘o‘) / )   /    Jingle    \
(           )  <     Bells
 (  ‘> <’  )    \              /
    /    \       \____________/
   /      \
  ‘ – “ - ‘

Slightly ungolfed:

def angel(s):
    a, b = s.split()
    u = '_' * 12;
    out = "99" + u + "\n"
    out += "(\\3___3/)4/66\\\n"
    out += "( \\ (‘o‘) / )3/4" + a + "4\\\n"
    out += "(92)2<5" + b + "\n"
    out += " (2‘> <’2)4\\95/\n"
    out += "4/4\\7\\" + u + "/\n"
    out += "3/6\\\n"
    out += "2‘ – “ - ‘"
    [print(' '*int(x) if x.isdigit() else x, end='') for x in out]

It replaces numerical digits with the same number of spaces.

Python 3.6 - 286 241 224 bytes

def x(L):X,Y=L.split();E,D=' '*11,'_'*12;print(f"""{' '*18}{D} 
(\   ___   /)    /{E} \\
( \ (‘o‘) / )   /    {X+' '*(10-len(X))}\\
({E})  <     {Y}
 (  ‘> <’  )    \{E}   /
    /    \       \{D}/
   /      \ 
  ‘ – “ - ‘""")

Input:
x("Silent Night")

Output:    
                  ____________
(\   ___   /)    /            \
( \ (‘o‘) / )   /    Silent    \
(           )  <     Night
 (  ‘> <’  )    \              /
    /    \       \____________/
   /      \ 
  ‘ – “ - ‘

Note - The version is 3.6 where string literal formatting was introduced. Hence, this won't work in earlier versions.