With a wide variety of music available, most tracks will be fine for use in osu!, providing that they are not:
- Intensely explicit, suggestive, or otherwise extremely confrontational in regards to shocking, obscene or highly sexual content
- Glorifying, promoting or otherwise encouraging suicide, murder, or self-harm
- Promoting racial tension or division
- Extremely and unbearably loud or excessively clipped
Tracks with explicit lyrics can still be used so long as they do not overtly violate the criteria above.
They will need to be identified by a line in the beatmap's description reflecting the sensitive nature of the content. They must also not have the preview point of the map set to a portion of the song that widely broadcasts said explicit content.
This is a mildly complicated issue and what is acceptable for one person is often not for another.
To address this, roughly apply a variant of the 20% rule - is more than 20% of your track's lyrical content a direct reference to something explicit, suggestive, or otherwise controversial?
If so, or if approaching the case, you may want to consider mapping something else. It probably isn't okay.
Any track that is highly intense or shocking in any manner as described in the three criteria above is not allowed regardless of what percentage of its content falls under the classification.
What determines "highly intense" should be abundantly obvious to a large selection of random people.
Any beatmap containing a disallowed track will be removed from the BSS.
All users are given a three submission leeway before penalties are handed out due to the uncertain nature of this rule.
Having any map of yours ranked will restore a 'charge' of the leeway to a maximum of three.
Each time your submission is removed, you will be afforded an explanation by the presiding member of the QAT or GMT responsible for the removal with reasoning justifying the removal.
You may contest this with them via PM if you so wish, or seek the opinions of others to substantiate your claim to the track's suitability. If you still cannot find common ground on this front, your claim may be escalated to a consensus vote among the current QAT, who will collectively decide if your track is acceptable or not.
After the leeway has passed, users who continually choose to upload inappropriate tracks will face a 42hr infringement.
My comment from the thread: