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By Brian Tivol
Answer: NINE ONE ONE

It's the return of Hum a Few Bars from 2002. This time, the songs are all by The Police:

Indices Song
07, 22, 13 Spirits in the Material World S O M
08, 06, 13 Every Breath You Take E B O
11, 14, 04 Voices Inside My Head D Y C
07, 13, 13 Don’t Stand So Close to Me A L L
12, 05, 11 Synchronicity T H I
12, 14, 18 Can’t Stand Losing You S N U
01, 07, 05 Murder by Numbers M B E
13, 09, 11 Tea in the Sahara R S H
02, 01, 10 Walking on the Moon A W T
10, 14, 08 Walking in Your Footsteps Y F I
02, 10, 01 Bring on the Night R E B
11, 09, 12 Wrapped Around Your Finger U R N
02, 03, 04 King of Pain I N G
12, 09, 14 Message in a Bottle O N T
06, 12, 17 Truth Hits Everybody H E D
27, 15, 30 Every Little Thing She Does Is Magic A N C
12, 11, 09 Hole in My Life E F L
02, 02, 01 Roxanne O O R

The indicated letters spell “Somebody call THIS NUMBER, shawty fire burning on the dance floor.” That’s from a song absolutely not by The Police, and it’s not even about the police, but such is life in this treacherous dungeon.

Your answer is the missing lyric, spelled out just as all the other numbers in the puzzle have been spelled out: NINE ONE ONE.