The use of language in both texts differs, with relation to their purpose and their notion of friendship. In the essay, the use of language is more sophisticated, delicate more complex, almost as the friend or person Hazlitt is describing. The language also matches the nature of the friendship- more of the intellectual- "practical benevolence is not is forte", meaning that it wasn't a friendship on the day to day basis, or that he will offer help and favors. It sees this idea as "idle and vulgar". This stands in such contrast to the song, almost making a mockery out of it because the language and situations described in it is at times so vulgar "if you are ever lost your teeth and you are out to dine, borrow mine". This is part of the songs' purpose- to be humors, silly, fun. The song talks about a very different notion of friendship- one that’s always there to help, almost to un-realistic measures "when other friendships have been forgot, ours will still be hot"
The tone and register are also influenced by the purpose of the text. The account of friendship in the essay is of someone describing a very specific, special person, who is very important to him. This, although he knows it is a friendship with out obligations, and that he should not look to his friend for help, we as readers still get the notion that this friend is still very important to the writer and that he, by his own description, feels very secure and welcomed, at the presence of his friend. This is again seen in the language, where the writer carefully chooses imagery and words to describe the person in question "the husk, the shell of humanity is left at the door, and the spirit, mellowed by time, resides within!". In the song the register is different. It seems like the singer is addressing the 'friend' directly, telling him that he will always be there. However, there is not one single line telling us about the friend in more detail, or any clue at any deeper emotions or more complex relationship. This is because of the nature of songs. Very smartly it allows us to apply it to anyone- because of the lack of specifics it can be affiliated with any per of people, but at the same time the direct form of address allows for the feeling of personalization; it can be used between two people.
In both texts the imagery used is closely linked with the notion of friendship it is describing. The essay using "his silver accents, beautiful, venerable as his silver hairs, but abundant, flows as a river" creating gentle, delicate images. From the imagery we learn that the man described is probably older, and has and air of knowledge and advice to him. "his hand is closed, but what if that? His eye is ever open…" his eye is ever open suggests that he is very observant, knows a great deal and constantly aware of the situation around him. The closed hand, however, is a powerful metaphor for the lack of obligation and physical help. This stands in such contrast to the song, where it seems that the friendship is based on constant physical being. All the imagery stands along the lines of 'if you need a hand when in trouble just call my name…', everything is to do with actions not words. Further more, all imagery is vulgar, everyday colloquial language, funny unreal situations. Is this the reflection of the friendship? I believe it is merely because of the appeal it has to have to the public. Thus we get imagery like "if they ever cook your goose, turn me loose".
To conclude, I think the differences of the texts out-weigh the similarities, and that they are quite noticeable. I got the feeling that the essay is almost mocking the song and that in light of the essay it shows that the song has no real message or statement concerning friendship. It almost ridicules itself, the imagery and the rhymes flattening the notion of friendship making it something so explicit, so out of touch with reality and how friendships truly work, with all the subtleties. The song is there for the sake of entertainment alone. However, it interesting to see how in both texts the language, imagery and tone were so effected by the purpose.