Recent laws passed to protect music and extend copyright for certain works have made it so that the latest copyright date for a piece of music to be considered public domain is 1923. Anyone can create a version or arrangement of a public domain song, and then copyright that version under his/her name. This makes this particular arrangement of the song untouchable by anyone except the arranger, even though the original song from whence it came is still part of the public domain.
Aminoglycosides can cause eighth cranial nerve damage, resulting in vestibular and/or auditory toxicities. Symptoms include dizziness, nystagmus, vertigo, ataxia, tinnitus, and varying degrees of hearing impairment.
A drug may be classified by the chemical type of the active ingredient or by the way it is used to treat a particular condition. Each drug can be classified into one or more drug classes. Aminoglycosides are a group of bactericidal antibiotics, which act by inhibiting bacterial protein synthesis. Their use is restricted because of potential side effects, as they can cause ear and kidney damage. All the aminoglycosides resemble each other in antibacterial activity, pharmacokinetics and toxicity.