I know nothing but here's my prediction for the top 100 (sorry for the amount of space it takes):
1. Vance Joy - Riptide (2013, #1)
2. Tame Impala - The Less I Know The Better (2015, #4)
3. Arctic Monkeys - Do I Wanna Know? (2013, #4)
4. Billie Eilish - bad guy (2019, #1)
5. Hilltop Hoods - Cosby Sweater (2014, #3)
6. Ocean Alley - Confidence (2018, #1)
7. Gotye feat. Kimbra - Somebody That I Used To Know (2011, #1)
8. Flume feat. Kai - Never Be Like You (2016, #1)
9. Angus & Julia Stone - Big Jet Plane (2010, #1)
10. Gang Of Youths - Let Me Down Easy (2017, #2)
11. alt-J - Breezeblocks (2012, #3)
12. Tame Impala - Let It Happen (2015, #5)
13. Matt Corby - Brother (2011, #3)
14. Hilltop Hoods feat. Montaigne & Tom Thum - 1955 (2016, #4)
15. The Rubens - Hoops (2015, #1)
16. Childish Gambino - Redbone (2016, #5)
17. Kendrick Lamar - HUMBLE. (2017, #1)
18. M83 - Midnight City (2011, #5)
19. Tash Sultana - Jungle (2016, #3)
20. Billie Eilish - when the party's over (2018, #8)
21. Foster The People - Pumped Up Kicks (2010, #32)
22. Lorde - Royals (2013, #2)
23. Gang Of Youths - Magnolia (2015, #21)
24. Daft Punk feat. Pharrell Williams - Get Lucky (2013, #3)
25. FISHER - Losing It (2018, #2)
26. Mallrat - Charlie (2019, #3)
27. Gang Of Youths - The Deepest Sighs, The Frankest Shadows (2017, #5)
28. Mark Ronson feat. Bruno Mars - Uptown Funk (2014, #6)
29. Chet Faker - Talk Is Cheap (2014, #1)
30. Tame Impala - Feels Like We Only Go Backwards (2012, #9)
31. Lorde - Green Light (2017, #6)
32. Amy Shark - Adore (2016, #2)
33. Flume & Chet Faker - Drop The Game (2013, #5)
34. RÜFÜS DU SOL - Innerbloom (2015, #103)
35. Tones And I - Dance Monkey (2019, #4)
36. Jay-Z & Kanye West - Ni**as In Paris (2011, #98)
37. Arctic Monkeys - R U Mine? (2012, #40)
38. The Black Keys - Lonely Boy (2011, #2)
39. Travis Scott - SICKO MODE (2018, #3)
40. Kendrick Lamar - King Kunta (2015, #2)
41. Flight Facilities feat. Christine Hoberg - Clair de lune (2012, #17)
42. Of Monsters And Men - Little Talks (2012, #2)
43. Flume feat. Vera Blue - Rushing Back (2019, #2)
44. Billie Eilish & Khalid - lovely (2018, #17)
45. Angus & Julia Stone - Chateau (2017, #3)
46. RÜFÜS DU SOL - You Were Right (2015, #12)
47. Peking Duk feat. Nicole Millar - High (2014, #2)
48. Gang Of Youths - What Can I Do If The Fire Goes Out? (2017, #10)
49. The Wombats - Tokyo (Vampires & Wolves) (2010, #8)
50. Dean Lewis - Be Alright (2018, #6)
51. Hilltop Hoods feat. Sia - I Love It (2011, #10)
52. Lana Del Rey - Young And Beautiful (2013, #7)
53. Grouplove - Tongue Tied (2011, #16)
54. Tame Impala - Elephant (2012, #7)
55. Ruby Fields - Dinosaurs (2018, #9)
56. PNAU - Chameleon (2016, #11)
57. Flight Facilities feat. Giselle - Crave You (2010, #19)
58. The Rubens - My Gun (2012, #10)
59. Milky Chance - Stolen Dance (2014, #4)
60. Lime Cordiale - Robbery (2019, #7)
61. Peking Duk feat. SAFIA - Take Me Over (2014, #5)
62. The Jungle Giants - Feel The Way I Do (2017, #16)
63. Peking Duk feat. Elliphant - Stranger (2016, #9)
64. Kendrick Lamar - Swimming Pools (Drank) (2012, #71)
65. Marcus Marr & Chet Faker - The Trouble With Us (2015, #6)
66. Hermitude feat. Mataya & Young Tapz - The Buzz (2015, #8)
67. Sia - Chandelier (2014, #9)
68. Foals - My Number (2013, #29)
69. Lana Del Rey - Video Games (2011, #6)
70. Disclosure feat. Sam Smith - Latch (2012, #21)
71. The Wombats - Turn (2018, #12)
72. Thelma Plum - Better In Blak (2019, #9)
73. Violent Soho - Covered In Chrome (2013, #14)
74. The Weeknd feat. Daft Punk - Starboy (2016, #10)
75. Ball Park Music - Exactly How You Are (2017, #18)
76. Arctic Monkeys - Why'd You Only Call Me When You're High? (2013, #6)
77. Ball Park Music - She Only Loves Me When I'm There (2014, #19)
78. Flume - Holdin On (2012, #4)
79. The Amity Affliction - Pittsburgh (2014, #22)
80. The Black Keys - Howlin' For You (2010, #80)
81. 360 feat. Gossling - Boys Like You (2011, #8)
82. Birds Of Tokyo - Plans (2010, #4)
83. Methyl Ethel - Ubu (2017, #4)
84. The Weeknd - The Hills (2015, #19)
85. G Flip - Drink Too Much (2019, #6)
86. Frank Ocean - Thinkin Bout You (2012, #56)
87. Arcade Fire - Reflektor (2013, #16)
88. Illy feat. Vera Blue - Papercuts (2016, #7)
89. Florence + The Machine - Shake It Out (2011, #13)
90. The Jungle Giants - Heavy Hearted (2019, #8)
91. Mallrat - Groceries (2018, #7)
92. Denzel Curry - Bulls On Parade [triple j Like A Version] (2019, #5)
93. San Cisco - Awkward (2011, #7)
94. Lana Del Rey - Summertime Sadness (2012, #86)
95. James Blake - Retrograde (2013, #13)
96. PNAU - Go Bang (2017, #7)
97. Lorde - Team (2013, #15)
98. Amy Shark - I Said Hi (2018, #5)
99. Sticky Fingers - Gold Snafu (2014, #20)
100. Glass Animals - Gooey (2014, #12)
Top 8 placers not included:
- Little Red - Rock It (2010, #2)
- Ou Est Le Swimming Pool - Dance The Way I Feel (2010, #3)
(hope I'm proven wrong on those 2)
- Boy & Bear - Fall At Your Feet (2010, #5)
- Adrian Lux - Teenage Crime (2010, #6)
- Cee Lo Green - Fuck You (2010, #7)
- Boy & Bear - Feeding Line (2011, #4)
- Macklemore & Ryan Lewis feat. Wanz - Thrift Shop (2012, #1)
- Mumford & Sons - I Will Wait (2012, #5)
- Major Lazer feat. Amber Coffman - Get Free (2012, #6)
- Frank Ocean - Lost (2012, #8)
- Matt Corby - Resolution (2013, #8)
- Chet Faker - Gold (2014, #7)
- Chet Faker - 1998 (2014, #8)
- Major Lazer & DJ Snake feat. MØ - Lean On (2015, #3)
- Jarryd James - Do You Remember (2015, #7)
- DMA's - Believe [triple j Like A Version] (2016, #6)
- Flume feat. Tove Lo - Say It (2016, #8)
- Thundamentals feat. Mataya - Sally (2017, #8)
- Childish Gambino - This Is America (2018, #4)
I have 6, 11, 12, 12, 11, 10, 9, 10, 10 and 9 songs from the years respectively. That seems like I may be underestimating the more recent years but these are the songs I came up with
Innerbloom is the only non-top 100 one I've included, but I think What You Know, Levels, Dancing On My Own and Can't Hold Us are good shouts. I also just thought of Waves (Dean Lewis) which missed the top 200 as its release was in 2016 but its airplay and success were in 2017 (Kiiara's Gold was the same case a year earlier but I'm sure that has zero chance, unfortunately). I could also see Take Me To Church making the top 200 (if there is a top 200) even though triple j never played it.
My picks for The Wombats, The Jungle Giants, Ball Park Music, Violent Soho, The Amity Affliction and especially Sticky Fingers' biggest songs are basically just guesses - I expect they'll all get a lot of votes as artists, but suffer from having no obvious song to rally around. It might help if they promote a specific one on social media.