As with pop singing styles, the attractiveness or exciting qualities of a live opera vocal performance or recording are subjective and vary between listeners, cultures, and time periods. A soprano singing in the 1930s would elicit praise and applause for hitting a high note in a way that would be deemed unacceptable in the 2000s, because of the use of performance practices such as doing a long, drawn-out glissando up to reach the high note and then using a wide vibrato, wavering on the pitch so much that it is hard to discern which note they are singing.