Here is all the songs used in this mod as well as which internal music track they replace:

hl1_song11: Replay https://youtu.be/JmioJGXoyGI
hl1_song25_remix3: It was a good day https://youtu.be/8NlEODZK-ok
hl2_intro: MELTY BLOOD: GCV2005 - Neko Arc https://youtu.be/5tlM13Kba0o
hl2_song0: Nevermind https://youtu.be/0Ii3IWPEaz0
hl2_song1: Blue https://youtu.be/8VT5mTNzlDE
hl2_song2: Chipi Chipi Chapa Chapa https://youtu.be/tPLhCV-mN2s
hl2_song3: In the End https://youtu.be/U1zDp9923PU
hl2_song4: What does the fox say https://youtu.be/qCue2uGWZbY
hl2_song6: Baka Mitai https://youtu.be/MVrV1P7qEbc
hl2_song7: Freestyler https://youtu.be/-zhm3L4hXVQ
hl2_song12_long: 679 https://youtu.be/JQZyL2amu4E
hl2_song13: One https://youtu.be/I9XZmnSNFOY
hl2_song14: Melty Blood Type Lumina OST - Great Cat's Village R (Neco-Arc's Theme) https://youtu.be/wcpQ3aarHRU
hl2_song15: Bring me to life https://youtu.be/E-krWpqPWRE
hl2_song16: Down with the Sickness https://youtu.be/M2G-wIGStcc
hl2_song19: Everlong https://youtu.be/nh2OYK_faao
hl2_song20_submix0: Monster https://youtu.be/NdgWUeylzQk
hl2_song20_submix4: Feel Good Inc. https://youtu.be/1KBszSo-lJo
hl2_song23_suitsong3: Creep https://youtu.be/ZLPUDaAQjiU
hl2_song26: Snake Eater https://youtu.be/HamZ8rSsyhI
hl2_song29: Payphone https://youtu.be/ppL4nafvyQY
hl2_song30: Replay https://youtu.be/JmioJGXoyGI
hl2_song31: Stay With Me https://youtu.be/piEFTI47Ds4
hl2_song32: Country Roads https://youtu.be/44uS3zostg0
hl2_song33: Fly me to the moon https://youtu.be/YzYdM0nUkTQ
radio1: Nelly - Dilemma https://youtu.be/XisJD8V1Rqw
ravenholm_1: Mr. Brightside https://youtu.be/-5lzIZ0b2F8