▁and ▁AR T IST ▁are ▁the ▁same ▁field . ▁The ▁number ▁of ▁fields ▁and ▁their ▁length ▁is ▁restricted ▁to ▁ 4 , 2 9 4 , 9 6 7 , 2 9 5 ▁( the ▁maximum ▁value ▁of ▁an ▁unsigned ▁ 3 2 - bit ▁integer ), ▁but ▁most ▁tag ▁editing ▁applications ▁imp ose ▁str ic ter ▁limits . ▁F L AC ▁has ▁a ▁smaller ▁limit ▁of ▁ 2 4 - bit ▁in ▁a ▁M ET AD ATA _ B LOCK _ V OR B IS _ CO MM ENT , ▁because ▁it ▁stores ▁th umbn ails ▁and ▁cover ▁art ▁in ▁binary ▁big - end ian ▁M ET AD ATA _ B LOCK _ PI CT URE s ▁outside ▁of ▁the ▁F L AC ▁tags . ▁ ▁The ▁data ▁is ▁encoded ▁in ▁UTF - 8 , ▁and ▁so ▁any ▁conform ing ▁Unicode ▁string ▁may ▁be ▁used ▁as ▁a ▁value . ▁ ▁Any ▁tag ▁name ▁is ▁allowed , ▁and ▁there ▁is ▁no ▁format ▁that ▁the ▁data ▁values ▁must ▁be ▁in . ▁This ▁is ▁in ▁contrast ▁to ▁the ▁ID 3 ▁format ▁used ▁for ▁MP 3 s , ▁which ▁is ▁highly ▁struct ured . ▁Field ▁names ▁are ▁also ▁permitted ▁to ▁be ▁used ▁more ▁than ▁once . ▁It ▁is ▁encourag ed ▁to ▁use ▁this ▁feature ▁to ▁support ▁multiple ▁values , ▁for ▁example ▁two ▁AR T IST = ... ▁fields ▁to ▁list ▁both ▁artists ▁of ▁a ▁single ▁composition . ▁ ▁The ▁specification ▁gives ▁several ▁example ▁tag ▁names ▁such ▁as ▁T IT LE ▁and ▁TR ACK NUMBER . ▁Most